Boody Body EcoWear Mens Crew Neck T-Shirt - Cooling Athletic Short Sleeve Tee Rayon from bamboo Machine Wash We are going to go out on a limb here and say this will be the hands-down most comfortable tee shirt youve ever worn. Moisture-wicking, ultra-breathable, thermo-regulating Natural, cooling fabric is great for sensitive skin Machine washable 95% rayon made from bamboo, 5% spandex