Injinji Tetratsok Perfomance Series CoolMax Mini Crew Toesox Socks (Small, Black) Anatomical Molding System with CoolMax polyester conforms to your feet for increased blood and air circulation Anatomical, individual toe sleeves form a thin anti-blister membrane between toes to eliminate skin-against-skin friction 3-ply flex construction prevents sock movement while increasing wicking and circulation The precisely stitched Vector Heel prevents bunching and allows for a comfortable fit Double-layered welt top maintains shape for long lasting performance and support