Socks

Be sure to start your next run with footwear that offers as much comfort as possible. Our Run Targeted Cushion Ankle Socks are designed with cushion on the most impact-prone areas—the ball and heel of the foot—as well as other feel-good features like mesh zones for breathability, and Virtually Seamless toe. Plus, because they're made with responsibly sourced Merino wool, they're naturally odor-resistant and temperature-regulating. And, with Indestructawool technologies, they're built to last, mile after mile. Features: - Sock Height: Ankle - Sock Cushion: Targeted Cushion - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Overall 3.25" height - Made in the USA of Imported Yarn: 56% Merino Wool 39% Nylon 2% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

Find your comfort zone on every hike with our Women's Hike Light Cushion Low ankle socks. Formerly known as PhD Outdoor socks, these improved hiking socks are packed with all our tried-and-true sock innovations, like our Indestructawool technology for enhanced durability, our 4 Degree Elite Fit System and women's-specific fit, and our Virtually Seamless toe for even more comfort. We've extended durability zones and updated mesh areas to help maximize breathability without sacrificing the perfect sock fit. And soft responsibly sourced, ZQ-certified Merino wool handles the rest—working hard when you do. With a low ankle height that pairs perfectly with your low-cut hiking shoes, it's easy to stay comfortable on even the longest, most advanced hikes. Features: - Sock Height: Low Ankle - Sock Cushion: Light Cushion - Indestructawool technology with extended durability zones - Additional body-mapped mesh zones for added breathability - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Virtually Seamless toe for enhanced comfort - Women's specific fit - Made in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane *Specific percentage of recycled nylon will vary as we transition to 100% recycled nylon in future seasons.

Putting in mile after mile on training runs requires comfortable footwear, starting with your socks. Our Women’s Run Targeted Cushion Ankle Socks are designed to fit well, feel great, and perform even better. With a women’s specific fit, engineered mesh zones for breathability, and Indestructawool technology with extended durability zones, this sock covers all of the fit, comfort, and performance bases. What’s even better is that it’s made with responsibly sourced Merino wool, so you know you’ll get softness, odor control, and temperature regulation. So get on out there and make each mile count! Features: - Sock Height: Ankle - Sock Cushion: Targeted Cushion - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Women's specific fit - Overall 3.25" height - Made in the USA of Imported Yarn: 54% Merino Wool 41% Nylon 2% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

Our new and improved Hike Light socks, formerly PhD Outdoor, offer a women's-specific fit and bring you enhanced features to maximize comfort and help you get after it at the highest level. We've extended the durability zones to make them cover even more of the sock–offering the same comfort with even more strength. And updated mesh zones help improve breathability without sacrificing the perfect sock fit. Less pressure. More performance. Add these features to a lightly cushioned sock that already provides the highest degree of comfort, fit, and durability, and it's never been easier to go far and feel good. Features: - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Additional body-mapped mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Women's specific fit - Comfort welt with 'stay put' fit - Height 5.5" - Made in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane - Sock Height: Mini - Indestructawool technology with extended durability zones

Over 25 years ago, we invented the original Merino wool performance sock—the Classic Hike. The Classic Hike remains mostly unchanged and certainly unmatched in comfort. But today, it's getting upgraded. And that upgrade starts with recycled nylon—creating a more sustainable (but just as comfortable) sock. They're also made with responsibly sourced, ZQ-certified wool that was grown with a focus on ensuring environmental, social, and economic sustainability while also taking the best care of our Merino sheep. This is a cozy, capable classic that is never going out of style. Features: - Sock Height: Crew - Our first sock construction, only now featuring recycled nylon (content varies by style) - Elasticized arch brace for secure fit - Flat knit toe seam for additional comfort - Knit in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane

Over 25 years ago, we invented the original Merino wool performance sock—the Classic Hike. The Classic Hike remains mostly unchanged and certainly unmatched in comfort. But today, it's getting upgraded. And that upgrade starts with recycled nylon—adding more sustainability to our favorite socks. They're also made with responsibly sourced, ZQ-certified wool that was grown with a focus on ensuring environmental, social, and economic sustainability while also taking the best care of our Merino sheep. This is a women's cozy, capable classic that is never going out of style. Features: - Sock Height: Crew - Sock Cushion: Light Cushion - Our first sock construction, only now featuring recycled nylon (content varies by style) - Elasticized arch brace for secure fit - Flat knit toe seam for additional comfort - Knit in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane

Our Hike Full Cushion Crew socks, formerly PhD Outdoor, use cushioning on the entire sock to help maximize warmth and protection. These responsibly sourced, ZQ-certified Merino wool hike socks are built with our top sock tech, including Indestructawool technology for enhanced durability, our 4 Degree Elite Fit System for a dialed-in, performance-oriented fit, and our Virtually Seamless toe for maximum in-shoe/boot comfort. We've updated our hike line by improving mesh zones for additional breathability, as well as creating a new ply structure that reduces pilling while enhancing hand-feel and comfort. Not to mention, our best-feeling, best-fitting hiking socks are now made with recycled nylon—making these socks more sustainable than ever. Now that's something you can feel good in and about. Features: - Sock Height: Crew - Sock Cushion: Full Cushion - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Additional body-mapped mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Indestructawool technology with extended durability zones - Comfort welt with 'stay put' fit - Height 8" - Made in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane

Legendary Darn Tough construction for when "equipment failure" is not an option. Performance Trail Fit means no bunching, no slipping, no blisters. Side vents deliver superior breathability. - 61% Merino Wool 37% Nylon 2% Lycra Spandex

The sock that made a name for itself from the Pacific Crest Trail to the AT. "Must pack" durability meets undeniable comfort in a Full Cushion sock that absorbs the rigors of the trail. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Naturally Antimicrobial: Repels bacteria and odor. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - Boot socks sit mid-calf for added protection and warmth. A sturdy companion. - 66% Merino Wool 32% Nylon 2% Lycra Spandex - Additional warmth and protection are the signature characteristics of midweight yarns in the Hike/Trek category. Cushioning Details - Cushion in the Hike/Trek category features terry-loops under the foot, and in the taller styles reaches above the ankle for comfort and protection.

Light, versatile and always up for more. A dialed-in precise fit makes for a won't-quit sock when the challenges pile up. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - Our no-show socks are the toughest socks you will never see. When your shoes are on this sock is gone. - 52% Merino Wool 44% Nylon 4% Lycra Spandex - The lightweight yarns in the Athletic category deserve a decathlon pun based on their all-time performance in all active life choices. Cushioning Details - NO CUSHION - Athletic socks with no cushion provide the lowest-profile fit with a light feel.

Drink from enough streams and you'll eventually get an explosive reaction. Look closely at this hike sock and you'll see what we mean. However, a blown-out seam should be the least of your worries. That's why the Number 2 is #1 when it comes to long-lasting toughness and active comfort. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Naturally Antimicrobial: Repels bacteria and odor. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - The micro crew is a shorter, more concise take on the traditional crew-height. Peeks just above the top of a standard hiking boot. - 63% Merino Wool 35% Nylon 2% Lycra Spandex - Additional warmth and protection are the signature characteristics of midweight yarns in the Hike/Trek category. Cushioning Details - Cushion in the Hike/Trek category features terry-loops under the foot, and in the taller styles reaches above the ankle for comfort and protection.

Aliens, bears and camels: We named this sock after everything you're likely to see on an un-average hike, and built it with enough cushioning to keep you cozy when the going gets weird. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - Boot socks sit mid-calf for added protection and warmth. A sturdy companion. - 60% Merino Wool 38% Nylon 2% Lycra Spandex - Additional warmth and protection are the signature characteristics of midweight yarns in the Hike/Trek category. Cushioning Details - Cushion in the Hike/Trek category features terry-loops under the foot, and in the taller styles reaches above the ankle for comfort and protection.

If you redesign one of the most popular socks in the line you better come correct. Increased breathability with mesh panels on top of the foot, a new smooth ribbing upper that stays put forever, and extended cushion over the Achilles – just a few heavy additions to one of the lightest hike socks out there. - 54% Nylon 43% Merino Wool 3% Lycra Spandex

Whether you run on a treadmill, on a sidewalk, on a track, or on a trail, your feet should stay as comfortable as possible. These low ankle socks are built to help with that. They offer a performance-oriented fit, breathability, and reduced slippage. Plus, their Indestructawool technology helps them last through the miles, and the targeted cushioning on the ball and heel of the foot add just the right support. And because they're made with ZQ-certified Merino wool, they're comfortable and odor-resistant. For better comfort on your next run, choose our Run Targeted Cushion Low Ankle sock. Features: - Sock Height: Low Ankle - Sock Cushion: Targeted Cushion - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Achilles tab prevents sock from slipping into footwear - Made in the USA of Imported Yarn: 54% Merino Wool 41% Nylon 2% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

Our Classic Hike Full Cushion Crew socks focus on comfort and durability, so you can go farther on every hike. Responsibly sourced, ZQ-certified Merino wool keeps things soft, while recycled nylon keeps it all sustainable. And full cushioning on the entire sock adds the warmth and protection you need and love. Stay cozy out there with our updated Classic Hike socks. Features: - Sock Height: Crew - Our first sock construction, only now featuring recycled nylon (content varies by style) - Flat knit toe seam for additional comfort - Elasticized arch brace for secure fit - Knit in USA of Imported Yarn: 56% Merino Wool, 11% Nylon, 31% Recycled Nylon, 2% Elastane - Sock Cushion: Full Cushion

Our Solid Crew delivers legendary Darn Toughness with sophisticated styling. Be ready for whatever the day brings. And do it in comfort. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Naturally Antimicrobial: Repels bacteria and odor. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - A classic, versatile height, crew socks hug the calf. A sock drawer staple. - 57% Merino Wool 41% Nylon 2% Lycra Spandex - The lightweight yarns used in the Lifestyle category are designed for everyday use and feature a silky, low-profile feel. Cushioning Details - Lifestyle socks with no cushion offer the standard feel for daily-use casual, and dress socks.

Our Women's Run Zero Cushion Ombre Print Low Ankle socks have a cheeky brightness that won't get lost in your sock drawer. They're purpose-built for comfort and durability, with the 4 Degree elite fit system for a performance-oriented fit, a women's specific fit for comfort, a Virtually Seamless toe, breathable mesh zones, and Indestructawool and Shred Shield technologies. With comfort and style as part of their DNA, these women's run socks are designed to help you go far and feel good, run after run. Features: - Sock Height: Low Ankle - Sock Cushion: Zero Cushion - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Mesh zones for added breathability - Shred Shield technology reduces wear from toes - Virtually Seamless toe for enhanced comfort - Women's specific fit - Achilles tab prevents sock from slipping into footwear - Made in the USA of Imported Yarn: 51% Merino Wool 25% Nylon 19% Recycled Nylon 4% Elastane 1% Polyester *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

Built for the coldest deep winter riding with our most insulating materials, our Merino Deep Winter Tall Socks are sure to keep your feet warm and dry. - VaporRize™ blend of polyester and Richter™ merino wool offers exceptional warmth and odor protection - Full terry foot and front of ankle construction for exceptional heat retention - Resisted® carbon yarn toebox speeds moisture wicking keeping your warmer longer without the extra bulk - Calf High - 18cm/7in with seamless toe construction - Fabric Content: 35% Merino Wool, 30% Polypropilene, 25% Polyamide, 5% Polyester, 5% Elastane

Hit that new trail in the Performance Hike Light Cushion Low Ankle sock, and you'll be smiling from start to finish. This responsibly sourced Merino wool sock is enhanced with the 4 Degree elite fit system for a dialed-in, performance-oriented fit. Plus, the Virtually Seamless toe offers a smoothed-out experience for even greater comfort. And, because these socks offer body-mapped mesh zones, your feet will enjoy breathability in all the right places. Get ready for comfort-filled hiking, mile after mile. Features: - Sock Height: Low Ankle - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Additional body-mapped mesh zones for added breathability - Virtually Seamless toe for enhanced comfort - Made in the USA of Imported Yarn: 57% Merino Wool 11% Nylon 30% Recycled Nylon 2% Elastane - Sock Cushion: Light Cushion

Paying homage to a classic fly-fishing technique, the Spey Fly sock takes its name from Scotland's River Spey and inspiration from our own fly-fishing guru and Mill patriarch, Marc Cabot. He's the real deal. This lightweight lifestyle sock is too. It features terry loops knit under foot for cozy cushioning and our signature Merino Wool durable construction. While you may never reel in stream dolphins like Marc does, you can sport the same socks. - 51% Nylon, 47% Merino Wool, 2% Spandex Lycra

A lightweight hiking sock, perfect for summer hikes into the fall. The smooth, low-profile leg is knit in our signature Micro Crew height for a more contemporary style you'll want to wear often. Cushion under the foot adds comfort on the trail and a little coziness in the cabin. A great fitting sock for a low hiking boot or trail shoe. Named for a section of The Long Trail—Vermont's own thru-hike-about halfway through. And made not too far away from there. - 51% Nylon 46% Merino Wool 3% Lycra Spandex

The sock that made a name for itself from the Pacific Crest Trail to the AT. "Must pack" durability meets undeniable comfort in a Full Cushion sock that absorbs the rigors of the trail. - 64% Merino Wool, 33% Nylon, 3% Lycra Spandex

This is the only bear your feet will want to encounter when you're exploring the great outdoors. A lightly cushioned hiking sock with all the anti-funk qualities of Merino Wool, the Bear Town gives you freedom and flex to hike your way out of any unexpected encounter on the trail. - 54% Nylon 43% Merino Wool 3% Lycra Spandex

From the AT to the Pacific Crest Trail, our "1466" Hiker raised the bar on what the ultimate hiking sock needs to deliver. Each year we hear from countless thru-hikers that this rugged sock is the only option that truly takes on the rigors of the trail. Discover the trail legend for yourself. - Men's micro crew socks average 8.5 in. from heel to cuff - expect them to show about 6 in. above a low hiking shoe or just above a standard hiking boot. - A performance fit means no slipping, no bunching, no blisters for peak hiking comfort. - Our 1466 is one iconic sock. We've made improvements along the way, because that's what we do, but you can't argue with a classic. - Reinforced footbed and Achilles cushion improves the comfort of our socks and helps them last longer. - Merino Wool is at home on the trail, naturally moving moisture to keep feet fresh and dry in all weather. - Our all-season weight, midweight socks thermoregulate to wrap feet in steady comfort when temperatures change. - The "still" in Still Made in Vermont, USA is personal. We knit all our socks at our VT-based Mills - we can't imagine it any other way. - Unconditionally Guaranteed for Life - if these aren’t the longest lasting socks you’ve ever owned, return them for another pair. - 61% Merino Wool 36% Nylon 3% Lycra Spandex

Our Women's Run Zero Cushion Low Ankle socks offer the comfort and durability that will help make every mile feel good. Indestructawool and Shred Shield technologies increase the sock's durability, while the 4 Degree elite fit system, Virtually Seamless toe, women's specific fit, and breathable mesh zones increase its comfort. No matter if you're hitting the trail, the pavement, or the treadmill for some good old-fashioned training miles, be sure your gear includes the sock that will help you stay comfortable on every stride. Features: - Sock Height: Low Ankle - Sock Cushion: Zero Cushion - Indestructawool technology with extended durability zones - 4 Degree elite fit system for a dialed-in, performance-oriented fit - Mesh zones for added breathability - Shred Shield technology reduces wear from toes - Virtually Seamless toe for enhanced comfort - Women's specific fit - Made in the USA of Imported Yarn: 46% Merino Wool 29% Nylon 22% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

Slip-on this ultra-lightweight no-show Merino Wool sock for blister-blasting protection and sweat-wicking power that you don't have to see to believe. Working hard behind the scenes, our most minimal running sock guards against dirt and stays put, so you can set your best pace—plain and simple. Features: - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from the skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Naturally Antimicrobial: Repels bacteria and odor. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable, and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs: - Our no-show socks are the toughest socks you will never see. When your shoes are on this sock is gone. - 54% Nylon 39% Merino Wool 7% Lycra Spandex - For the ultimate like-it's-not-even-there fit and feel, ultra-lightweight yarns give our running socks the lowest in-shoe profile. Cushioning Details: - Terry loop cushion isolated under the foot for rebound in these incredibly light running socks.

If you redesign one of the most popular socks in the line you better come correct. Increased breathability with mesh panels on top of the foot, a new smooth ribbing upper that stays put forever, and extended cushion over the Achilles—just a few heavy additions to one of the lightest hike socks out there. Features - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Naturally Antimicrobial: Repels bacteria and odor. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs - The micro crew is a shorter, more concise take on the traditional crew-height. Peeks just above the top of a standard hiking boot. - 54% Nylon 43% Merino Wool 3% Lycra Spandex - The versatile lightweight yarns in the Hike/Trek category maintain a low profile in modern trail footwear and proper performance on multi-day trips. Cushioning Details - Cushion in the Hike/Trek category features terry-loops under the foot, and in the taller styles reaches above the ankle for comfort and protection.

We're a USA-made, family-run company, so you know we appreciate quality and keepin' it local. The Farmer's Market sock is our ode to sustainable living and local support. Fine-gauge knitting hugs your feet, and you can think of it as a little hug for the earth, too, since it should last you for life. Features: - Performance Fit: No slipping, no bunching, and no blisters. - Fine-Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. - Fast-Action Wicking: Pulls moisture away from the skin. Fast-drying. - All-Weather Performance: Cool in the summer, warm in the winter. - Guaranteed For Life: No strings. No conditions. For life. - Merino Wool is fast-drying, breathable, and odor-resistant for all-day comfort. - True Seamless: Undetectable seam fusion for an ultra-smooth, invisible feel. Specs: - A classic, versatile height, crew socks hug the calf. A sock drawer staple. - 58% Merino Wool 38% Nylon 4% Lycra Spandex - The lightweight yarns used in the Lifestyle category are designed for everyday use and feature a silky, low-profile feel. Cushioning Details: - NO CUSHION - Lifestyle socks with no cushion offer the standard feel for daily-use casual, and dress socks.

Our Everyday Anchor Line Crew socks will help keep you comfortable on your everyday adventures. With features like a secure fit and a comfort welt with a “stay put” fit, the only thing moving will be you. Their classic colors can complement any outfit, keeping you stylish from head to toe. Plus, they've got all the benefits of Merino wool construction, including odor resistance and temperature control, so you can feel confident, whether you're running the morning errands or going out with friends. Features: - Sock Height: Crew - Sock Cushion: Zero Cushion - Secure fit for all-day comfort - Versatile durability - Comfort welt with 'stay put' fit - Shred Shield technology reduces wear from toes - Virtually Seamless toe for enhanced comfort - Overall 8" height - Made in the USA of Imported Yarn: 57% Merino Wool 38% Nylon 2% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons.

If you redesign one of the most popular socks in the line you better come correct. Increased breathability with mesh panels on top of the foot, a new smooth ribbing upper that stays put forever, and extended cushion over the Achilles – just a few heavy additions to one of the lightest hike socks out there. - 54% Nylon 43% Merino Wool 3% Lycra Spandex