We went surfing this morning. We were very careful to slather ourselves with waterproof SPF 30 before we went, but apparently it wasn't enough. We're both hurting with serious burns, especially our backs and back of legs since that's what was up for two hours. We rented the boards from 10:30 to 12:30. I only caught one wave, but at least it was a nice long ride. My upper body is weak, so paddling is very difficult.