Review on Safe Sea SPF50+ Kids Sunscreen: Ultimate Protection Against Jellyfish and Sea Lice | Reef-Safe, Water Resistant, Sensitive Skin | Paraben & Chemical Free | 4 fl. Oz. Pack of 2 by David Magnus

I've been using this sunscreen for my sun for a few years now. I don't know how it works but since using it he hasn't had any problems with jellyfish or sea lice bites. We travel and drive a lot. I will say that the sea lice did not bite his limbs (where I applied the sunscreen) but he did bite under the rashguard and shorts (no sunscreen). So it worked out well for us. I don't use this sunscreen on his face, not because he's ever had a reaction, but simply because I'm concerned about the chemicals. He also never got a sunburn with this sunscreen.