4.2 oz., 52/48 Airlume combed and ringspun cotton/polyester, 32 singlesAthletic Heather and Black Heather are 90/10 airlume combed and ringspun cotton/polyester Heather Prism colors are 99/1 airlume combed and ringspun cotton/ polyester (Unique coloring, grey flecks of heather pulled through the base color)Side seams, retail fitShoulder to shoulder tapingUnisex sizing