30 singles Athletic Heather is 90% combed and ringspun cotton, 10% polyester Dark Grey Heather & Heather Navy are 52% combed & ringspun cotton, 48% polyester Heather Brown & Heather Green are 52% combed & ringspun cotton, 48% polyester Charcoal Marble & Navy Marble 91% poly,9%combed/ringspun cotton 30singles,4.0oz. White Marble is 91% polyester, 9% combed and ringspun cotton 30 singles, 4.0 oz.