Poor sunscreen application and the inherent disability to actually coat the skin with sunscreen means that skin, albeit a small portion, will still enter in contact with sunlight. It is also possible that at such high concentrations the absorption vs. concentration curve will break down, where the greater density of molecules is no longer able to effectively add to the absorption Tof UV light. It is also important to note that this absorption is only at one wavelength, not across the entire spectrum. Other wavelengths, especially those in the UVA region, would incur much less absorption, though still at levels higher than 99%, as illustrated in Phase 1