We recommend you protect all of your skin with a combination of clothing, hats and broad spectrum sunscreen. Our fabric has been tested to protect against 98% of the ultraviolet rays but doesn't erase the damage that has already been done. It is always possible to have more signs of aging, or even skin cancer, in areas that are being covered by our products because of past ultraviolet DNA damage. Additionally, other factors can cause skin cancer and aging such as genetics, viruses, and other environmental exposures which our products will not protect against.