ASICS Kayano Wool Quarter Running Socks 36% nylon 30% Merino Wool/28% Polypropolene/ 36% Nylon/ 6% Elastane 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. Soft cuff keeps cold air out and terry surface at outer thumb for nose wiping