3.7 oz., 50% polyester, 25% ringspun cotton, 25% rayon; polyester retains shape, cotton comfortand rayon makes for a unique texture; superior screenprinting results; Tri Oatmeal is 3.9 oz., 50% polyester, 37% ringpsun combed cotton, 13% rayon; raglan sleeves; tubular; loose-fitting on top; snug around waist;