The water-resistance component of Ultra Veil SPF testing consisted of alternating water-immersion and drying procedures performed by an independent laboratory on ten human subjects. Per FDA guidelines, the water-immersion procedure begins at least 15 minutes after sunscreen application and immediately after obtaining an initial SPF reading. Subjects are immersed in water to cover the test area for 20 minutes. Immersion is followed by a 15-minute drying period. Then subjects are immersed again for 20 minutes followed by another 15-minute drying period. After these two sequential 20 minute immersions, repeat SPF testing is performed. This sequence must be performed to substantiate a water-resistant (40 minutes) claim and the SPF result on the product label must be from test results taken after water immersion. Ultra Veil's SPF 50+ water resistant (40 minutes) label reflects the results of these tests.