FITS Light Rugged &ndash; Crew Socks: Heavy-Duty Trail Socks for Hiking & Outdoor Merino Wool, Nylon, Polyester, Lycra Made in USA FIT: This rugged sock was made by FITS to prove that you can have a durable sock with extraordinary comfort. Made with their patented Full Contact Fit to hug the contours of your foot, this hiking sock also stays put on the long trails. FEATURES: The thermal insulation and moisture control of these outdoor socks ensure youre feet wont be soaked with sweat on your winter trail hikes. They also have a nylon exterior for added durability, because FITS knows winter hikes are tougher. TYPE: FITS crew socks are made to rise just below the calf for a superior fit that never lets you down in the comfort area. CUSHION: Speaking of comfort, these heavy-duty hiking socks are made with a full Merino wool cushion under the foot that extends all the way around the leg. Your feet wont know theyve been out on the trail when youre wearing these high-quality socks. FABRIC: When youre looking for a comfortable sock with a lot of durability, you want them made out of 62% Merino wool. 28% nylon, 7% polyester and 3% Lycra.