95% Bamboo Rayon, 5% Spandex. Bamboo Rayon Breathable Undershirts: Made from Bamboo Rayon-a kind of cellulose fiber extracted from bamboo. It is featured with good air permeability, instant moisture-wicking, and lightweight, and stable dyeing property. The bamboo rayon undershirts. Smooth Soft: High-end Bamboo Rayon fabric, to bring you ultra comfort and softness, more breathable and lightweight than cotton undershirts. Well-Fitted: Bamboo stretch fabric spandex undershirts with elasticity for better fitting, no constriction for daily wearing. Versatile Performance: With breathable bamboo rayon fabric, this mens slim fit undershirt is perfect as workout shirts, dress shirt undershirt. And it also good to wear as casual tees. DAMDDC220050302XL