A work sock, a sport sock, a boot sock. Any of these descriptors will fit this rugged work horse. 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. Our 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. Full Merino wool cushion under foot and all around the leg. Excellent thermal insulation and moisture control. Nylon exterior for durability. Over-the-calf length falls just below the knee.