Russell Mens Sport Perfromance 4-pack Boxer Briefs In Famous Brand Packs 90% Polyester/ 10% Spandex Brand New High Quality Boxer Briefs in Famous Brand Packaging Mesh Fly Ventillation for breathability, Engineered for an athletic fit Flatlock smooth seam reduces irritation dri-power 360 moisture wicking keeps you dry Package says 100% cotton but the are not. They are 90% Polyester/ 10% Spandex