It won't change the color or comfort of clothing, and one treatment is good for repeated washings (up to 20). One wash treatment per box.
Rit Sun Guard puts an invisible shield into clothing that helps block more than 96% of the sun's harmful rays from reaching your skin. Simply add it to the wash cycle, rinse and dry as usual. It's safe for the whole family.
For example, a typical white T-shirt is rated at UPF 5. A single treatment with Rit Sun Guard boosts its rating to UPF 30. (UPF stands for Ultraviolet Protection Factor and describes the fabric capability to prevent UV rays from reaching the skin.)