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. True Seamless™: Undetectable seam fusion for an ultra smooth, invisible feel. SPECS Cushion: Mid-level cushion density under foot. A warm and ultra-comfortable choice when conditions demand it. Boot Height: Sits mid-calf for added protection and warmth. A sturdy companion. 62% Merino Wool 36% Nylon 2% Lycra® Spandex