These Optimus Rhapsody tank tops are easy to use. Just put them on and enjoy the comfort. When it comes to sizing, men and unisex tops are available from XS to 2XL, while women's tops range from XS to 4XL. For washing, use cold water and turn the tops inside out. Wash them with similar colors. Only use non - chlorine bleach if necessary. After washing, hanging them to dry is the best option, but you can also use a tumble dryer on a cool or low - heat setting. Don't use fabric softener because it might make the colors fade. And remember, don't iron or dry clean these tank tops to keep them in good condition.