The Icebreaker Men's Hike+ Heavy Crew Sock is a thick cushioned sock for the long trail. Socks then boots to keep feet happy. Merino wool has been blended with nylon and Lycra to keep them durable as well as stretchy for long hours of putting foot to trail. Plenty of cushion underfoot to help soften the blow of each step plus they're odor-resistant to minimize the stink of your feet. Features of the Icebreaker Men's Hike+ Heavy Crew Sock Anatomically sculptured, fully and densely cushioned hike sock Fabric Details 66% Merino, 32% Nylon, 2% Lycra