This truly versatile base layer liner is the perfect companion sock to any of our Kenetrek socks. The high grade polypropylene is treated with a natural, silver based antimicrobial treament to give you an odor free, blister resistant sock liner, minus the weight and bulk. They wick, breathe, reduce firction… and the synthetic yarn will simply not wear through. Over the calf, men’s sizes M (5-8), L (9-12), XL (13-15) 2 Pair Per Package. Made in USA of 83% Polypropylene, 12% Nylon, 5% Lycra.