To use these Slave One Lager men's shirts, just put them on and enjoy the comfort. When it comes to washing, use cold water and turn the shirts inside out. Wash them with similar colors to prevent color bleeding. Only use non - chlorine bleach if there are stains. After washing, you can either hang them to dry for the best results or tumble dry on a cool or low - heat setting. Remember, fabric softener can make the colors fade, so skip it. And never iron or dry clean these shirts as it might damage the fabric.