The Alaska Sock from Kenetrek is a thick fitted sock with reinforced padding at the toes, heels and shin to protect against lacing pressure. Constructed with the perfect blending of fine merino wool fibers, known for excellent moisture control and temperature regulation with virtually no itch, and synthetics for additional durability. Super Heavyweight, over the calf. Men's sizes M(5-8), L(9-12) XL(13-15) Made in the USA from 60% Merino Wool, 33% Nylon, 5% Elastic, 2% Lycra.