The Thorlo Experia micro mini crew sock are made of Thor-wick COOL?â'?é?« moisture managing fiber to give long-lasting comfort. The ultra lightweight sock frames is made of Lycra?â'?é?« mesh to provide a contoured, aerodynamic, glove-like fit and maximum breathability. The Achilles tendon pads function a heel locks and reduces heel rubbing, chafing and blistering. It features Rib-knit cuffs. These socks feature padding in the ball and heel areas for cushioning.