Perform with the power and comfort of responsibly sourced, ZQ-certified Merino wool in our Hike Light Cushion Crew socks. Formerly known as PhDA(R) Outdoor, we&';ve updated our best hike socks to include more sustainable materials with the addition of recycled nylon, improved durability, updated mesh zones, and an even more perfect fit. But, don&';t worry. Our fan-favorite sock technologies aren&';t going anywhere-offering you the comfort and performance you expect from Smartwool. The crew height also adds extra coverage on the trails and light cushioning on the entire bottom of foot helps keep you comfortable when the ground isn&';t-helping you to hike on (and on.. and on..) Sock Height: CREW Indestructawool(TM) Technology with extended durability zones 4 Degree(TM) Elite Fit System for a dialed-in, performance-oriented fit Mesh zones for added breathability Virtually Seamless(TM) Toe for enhanced comfort Comfort welt with &';stay put&'; fit Made in the USA of Imported Yarn: 57% Merino Wool 6% Nylon 34% Recycled Nylon 3% Elastane *Specific percentage of Recycled Nylon will vary as we transition to 100% Recycled Nylon in future seasons. SW001614