To use these knit belt bands, simply wrap them around your waist and adjust as needed. They are suitable for various clothing styles and can add a trendy touch to your outfit. As for care, you can hand - wash them in cold water with a mild detergent. After washing, lay them flat to dry to maintain their shape. Be aware of the California Proposition 65 warning about the chemicals in the product, and avoid direct contact with skin for extended periods if you are sensitive.