Why can't I just use a T-shirt?
While a very heavy, dark, tightly-woven T-shirt may offer sun protection, most summer-weight cotton T-shirts offer as little as 10 SPF dry and lose 50% of their SPF when wet. The minimum SPF recommended by the American Cancer Society and others is 15. (The protective qualities of sunscreen are rated by the Sun Protective Factor-SPF-which indicates the length of time someone can spend outdoors without burning. When using a 15 SPF lotion, a person who normally burns after 20 minutes can tolerate 15 times 20 minutes(300 minutes) without burning.) In addition, our sun protective wear is designed for the water--it's quick drying and fits well, unlike a wet clammy T-shirt that hangs and may weigh you down in the water.
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