Body glide - why the sunscreen? 1 drop of knowledge

So my family and I were laughing about why a person would buy body glide with sunscreen. The glide is supposed to stop chafing but why would you need it in places where the sun do shine? Hmm, well, I think it has to do with the transitions. For example, we recently received our wetsuits and I glide all the far flung areas of the wet suit, like my calves and wrists and neck. Then after swimming when I bike, I take off the wetsuit (not like my helmet when I transition from biking to running) and those areas are exposed, but still all glided up. So the body glide stays and so does the sunscreen. Now you know.