These Moon Gym tank tops are easy to use. Just put them on and enjoy the comfort. For sizing, men and unisex sizes range from XS to 2XL, while women's sizes go from XS to 4XL. When it comes to cleaning, machine wash them cold and turn them inside out. Wash with similar colors and only use non - chlorine bleach if necessary. After washing, it's best to hang them to dry. But if you're in a hurry, you can use the tumble dryer on a cool or low - heat setting. Remember, fabric softener can make the colors fade, so skip it. Also, don't iron or dry clean these tank tops to keep them in good condition.