Copper Sole technology eliminates 99.9% of bacteria, fungi and odor in these comfortable high-tech socks. Unique support at arch for added performance and comfort with elastic infused uppers to ensure they stay in place during a hard ride. Embedded Copper ions in sock fibers regenerate, creating permanent protective barrier. Copper also plays a vital role in collagen formation, so wearing these socks makes for better looking and better smelling feet. Moisture-Guard wicking system and 10% copper CUPRON™ yarn, make these the most comfortable socks ever to grace your feet. Tallish crew height. M(5.5-8), L(8.5-12), XL(13-15)