These XENOS Rad Hero tank tops are super easy to use. Just put them on and enjoy the comfort all day long. For sizes, men and unisex ones go from XS to 2XL, and women's from XS to 4XL, so you can pick the perfect fit. When it's time to clean them, throw them in the washing machine on a cold cycle, turn them inside out and wash with similar colors. Only use non - chlorine bleach if needed. After washing, you can hang them to dry for the best look, or use the cool/low heat setting in the dryer. 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 great shape.