If you had to have only one pair of socks, look no further. The best merino wool available means four season comfort in any conditions. Quick drying and durable, these socks act as thermostats by naturally cooling or heating when needed. The reinforced heel and toes reduces slippage, while the arch support increases circulation and decreases foot fatigue. Designed to avoid blisters and abrasions, and innately odor free, these socks will take you from a snowy mountain hunt to a Death Valley hike. Boot height, men's sizes M(5-8), L(9-12), XL(13-15). Made in USA of 65% Merino Wool, 24% Nylon, 8% Elastic, 3% Lycra. Kenetrek Glacier Socks KE-1225