Our Vertex Micro Crew is one of the lightest crew socks on the planet. Stripped down to the core it still provides the perfect amount of cushioning. Lose the weight without sacrificing. Darn Tough Vertex Micro Crew Ultra-Cushion Socks 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. True Seamless™: Undetectable seam fusion for an ultra smooth, invisible feel. Ultra-Light Cushion: Provides a light layer of cushioning along the bottom of the foot. Ultra-Light, ultra-comfortable. Micro Crew Height: A shorter, more concise take on the traditional crew height. Peeks just above the top of a standard hiking boot. 51% Merino Wool 43% Nylon 6% Lycra® Spandex