They feature Targeted Compression, zone specific compression where you need it most for superior comfort and support. As a result they have an anatomical design, meaning they conform to the left and right structure of the foot. Ultra Light Cushion Engineered with anatomical design and Targeted Compression, providing a Custom-Like Fit and reduced risk of blisters, plus Ultra Light Cushioning takes up minimal room inside the shoe. No Show Tab Rests below the ankle. Feetures most popular and versatile silhouette. Designed with a tab that provides comfort and blister protection from friction caused at the back of the shoe. iWick Fibers Wicks moisture to keep feet cool and dry, while providing superior durability. 95% Nylon 5% Spandex. Machine wash cold. Tumble dry. No bleach or fabric softeners. For best results, wash socks inside out.