Our sticky bras are waterproof and sweat-proof! Wearing Good Lines under a bathing suit is actually one of our most common uses. Check out our favorite hack for the summer here! However, we strongly recommend you do not sunbathe in our products. Excessive heat or sun exposure can make the adhesive too hot, which can hurt (or burn) your skin. Do not expose our product to prolonged sun and heat exposure.  Do not wear our products two days in a row. Please remove Good Lines and see your doctor immediately if you experience itching, swelling, a rash or discomfort.