When you’re planning on an extended backpacking trip, you need socks that keep your feet comfortable and dry. SmartWool Expedition Trekking socks are designed for long miles on the trail and carrying a full pack. The wool in SmartWool socks is culled from New Zealand Merino sheep. SmartWool technology then makes use of Merino wool’s natural properties to produce a sock that’s soft enough to keep your feet from itching. Lightweight, SmartWool fibers have a hydrophobic interior and hydrophyllic surface that transfer and repels moisture away from the skin. The natural crimp of the Merino wool fiber forms tiny air pockets that let the fabric regulate your temperature, whether it’s hot or cold. Trekking socks have a heavy cushion instep for soothing comfort and a high-density sole. The 3 x 1 rib knit top and the increased elastic in the arch area ensure these crew-height socks won’t slide down on your feet. 77% Merino wool, 22% nylon and 1% elastic. Made in USA. Colors: Gray, Taupe. Men’s Sizes:M(6 to 8-1/2), L(9 to 11-1/2), XL(12-14-1/2).