4.2 oz. 100% combed and ringspun cotton 30 singles Ash is 99% combed and ringspun cotton 1% polyester Athletic Heather is 90% combed and ringspun cotton 10% polyester all other Heather colors are 52% combed and ringspun cotton 48% polyester Marble colors are 91% poly 9% combed and ringspun cotton 40 singles 3.5 oz. Neon colors are 52% combed ringspun cotton 48% polyester 40 singles 3.6 oz. retail fit fitted sleeves sideseamed