WINDAY Men Briefs Breathable Ice Silk Boxer Bikinis and Briefs N05 Note:Asian size is smaller than US/EU/UK size so please check your measurements to make sure the item fits before ordering. Material--Ice Silk ; Material--Nylon Asia size M:= US S--Waist 26"-29" ; Asia size L: = US M--Waist 29"-32" ; Asia size XL: = US L--Waist 32"-35" ; Non-trace,Ice silk and Constant temperature underwear