I just tried to google around for some info...I'm not sure how it works...I have never gotten burned either or even a tan through my shirt or clothes...I wonder if it reflects it in a way that it protects the arms, face, legs? The suits I seen cover from the neck down to the knees and elbows...some sites I read suggest that with this you don't have to worry about re-applying the sunblock...or on babies
...I think I would still have to lather my kids up cause I wonder how well it works...