These Bat Teerion tank tops are super easy to use. Just put them on and enjoy the comfort. For sizing, men and unisex sizes go from XS to 2XL, and women's sizes are from XS to 4XL. When it's time to clean them, use a cold water cycle in the washing machine. Make sure to turn them inside out and wash with similar colors. 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 tumble dry on cool or low heat. Remember, fabric softener can make the colors fade, so skip it. And don't iron or dry clean these tank tops to avoid damaging the material.