To use these shirts, simply put them on and enjoy their comfort. When it's time to wash, machine wash them cold inside out with clothes of the same color. Only use non - chlorine bleach if necessary. After washing, hanging them to dry is the best way to keep them in good shape, but you can also use the tumble dry setting with cool or low heat. Just be careful not to use fabric softener as it can make the colors fade. And remember, don't iron or dry clean these shirts to avoid damaging them.