4.2 oz., 100% combed ringspun cotton, 30 singles * Athletic Heather is 90/10 cotton/polyester * Blue Triblend, Charcoal Triblend, and Grey Triblend are 3.4 oz., 50/25/25 polyester/cotton/rayon, 40 singles * Neon Blue, Neon Green, Neon Pink, and Neon Yellow are 3.6 oz., 52/48 cotton/polyester, 40 singles