... 2,quick dry,thermal,anti-bacterial,odour free 100% polypropylene underwear/baselayer. Material:100% micro polypropyleneFabric can be 120g to heavier ... Featurers:1,light weight for underwear/base layer.2,Polypropylene dries three times quicker than polyester when get sweat ... fabric so you stay nice and warm.4,Polypropylene have no odour and anti-bacterial function. 100% polypropylene underwear/baselayer