4.2 oz., 100% combed and ringspun cotton * 30 singles * Athletic Heather is 90% combed and ringspun cotton, 10% polyester * Dark Grey Heather is 52% combed and ringspun cotton, 48% polyester * Navy Marble and Red Marble 91% poly, 9% combed/ringspun cotton 40singles, 3.5oz.