Performance Fit: No slipping, no bunching, and no blisters. Fine Gauge Knitting: Unprecedented durability and our unique "put it on, forget it's on" feel. Fast Action Wicking: Pulls moisture away from skin. Fast drying. All Weather Performance: Cool in the summer, warm in the winter. Naturally Antimicrobial: Repels bacteria and odor. Guaranteed For Life: No strings. No conditions. For life. Coolmax: Engineered to move moisture away from your skin and dry fast in warm conditions. True Seamless: Undetectable seam fusion for an ultra smooth, invisible feel. Provides a light layer of cushioning along the bottom of the foot. Ultra-Light, ultra-comfortable. The toughest sock you’ll never see. When your shoes are on this sock is gone. 52% Coolmax Polyester, 43% Nylon, 5% Lycra Spandex Still Made in America