The 13", 5.0-oz. Heavyweight sock is designed for superior warmth and moisture management. These Ultimax® socks don't just wick away moisture, they actually channel perspiration and moisture up and out of your footwear, where it can evaporate quickly. Full terry cushioning throughout the socks combines with thin, ultradense terry soles to provide superior cushioning without bulk, allowing you to still feel the lay of the land. 50% polypropylene, 29% Lumiza™ acrylic, 15% nylon, 5% wool, 1% spandex. 4.5mm thick. Sizes: M(5 to 8-1/2), L(9-12), XL(13-15), XXL(15-17).