A work sock, a sport sock, a boot sock. Any of these descriptors will fit this rugged workhorse. The 100% Merino wool is knit into a mid-weight construction of terry loops on the inside to control moisture while keeping you comfortably warm. The nylon exterior provides maximum durability and abrasion resistance. Full Merino wool cushion underfoot and all around the leg Excellent thermal insulation and moisture control Nylon exterior for durability Crew height rises just below the calf FITS patented Full Contact Fit hugs the contours of your foot and stays put so there are no loose socks to rub you the wrong way. Merino Wool 69% Nylon 24% Polyester 4% Lycra 3%