4.2 oz., 100% combed and ringspun cotton; 30 singles; Unisex sizing; Dark Grey Heather is 52% combed and ringspun cotton; Blue Triblend 50% poly,25% combed/ringspun cotton 25% rayon 40 singles, 3.4 oz.; Red Triblend 50% poly, 25% combed/ringspun cotton, 25% rayon 40 singles, 3.4 oz.; Grey Triblend 50% poly, 25% combed/ringspun cotton, 25% rayon 40 singles,3.4 oz.;