FEATURES 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. Merino Wool: The ultimate fiber for breathability and comfort in all conditions. SPECS Extra Cushion: Our thickest, burliest and highest density cushioning makes for a big, bad monster of a sock. Over the Calf Height: The name says it all. The ultimate height for keeping the outside-out. 72% Merino Wool 26% Nylon 2% LycraA(R) Spandex