ASICS Chafe Free Endurance Nylon 93%/ Lycra 7% Imported 79.7% Nylon/14.6% Tactel Nylon/5.7% Elastand Anatomically correct left and right foot construction and high density cushioning Articulated arch band for better fit and ASICS exclusive ankle fit Flexible horizontal lace pad cushioning. "Y" heel gore for improved fit, reducing slippage. 0.5 oz