Feetures! Elite Ultra Light Quarter Sock is the most technically advanced sock. The Elite socks are anatomically constructed using Feetures! Sock-Lock technology to provide targeted support where it’s needed most. As a result of this enhanced fit, the foot and sock become one. The Feetures! Elite Ultra Light sock is the thinnest sock in the range and fits like a second skin. Performance focused sock that doesn't lack in support and comfort. Care Instructions Machine wash cold. Hang to dry. No bleach or fabric softeners. For best results, wash socks inside out.