Genius design Wacky Sox with an ultra high performance  foot made from 75% Coolmax and 25% Polyamide. Coolmax is a moisture  management fabric featuring advanced wicking technology which helps keep  moisture away from your skin to keep you dry and cool, so you can play  harder. The leg of these socks is 5% Elastane 95% Polyamide.  Elastication around the centre of the foot helps avoid 'bunching' or  slippage, while the elastication around the ankle provides additional  support.