The idea of this product is basically, you apply it everywhere and it is supposed to last for 10 hours. This particular formulation is equivalent to spf20, however i know an spf10 version also exists. The reason this product is supposed to work so well is that it blocks 90% of the UVB rays (the ones that cause the burn).They also claim it is still 90% effective after water exposure, as it is extremely water resistant. It sounds a very interesting product, and there seems to be many a positive review floating around.
My question is would you trust a suncream that you could apply once and leave all day? The idea is promising, no messy reapplications sounds like heaven. But, do I dare trust it?