Injinji Performance Mini-Crew Toe Socks 100% Spandex Soft, breathable, moisture-wicking fabric; 70 percent Coolmax, 25 percent nylon and 5 percent Lycra Recipient of the 2008 Seal of Acceptance by the American Podiatric Medical Association (APMA) Individual, seamless toe sleeves prevent skin-on-skin friction while providing enhanced posture, gripping, and balance Anatomical Interface System (AIS) is engineered to separate your toes and promote healthy digital alignment Machine wash on warm or hand wash your toesocks after each use; do not machine dry or dry clean