These Guiseigne tank tops are super easy to use. Just put them on and feel the comfort. For men and those who prefer unisex styles, the sizes range from XS to 2XL. Women can choose from sizes XS to 4XL. When it comes to cleaning, remember to machine wash them cold and turn them inside out. Wash with like colors to prevent color bleeding. Only use non - chlorine bleach if necessary. After washing, it's best to hang them to dry. You can also use the tumble dry function, but set it to cool or low heat. Don't use fabric softener because it might make the colors fade. And never iron or dry clean these tank tops to keep them in good condition.