I don't even pretend to understand the question, but FWIW, maybe you CAN wear it backward. When foam helmets were new--what was it, 15 or 20 years ago--a friend of mine bought a pair for himself and his wife. He's a very experienced, hard-core ultradistance rider, does several centuries a year, but they both wore the helmets backward (inadvertently) for weeks, until somebody looked at them and said, "Uh, excuse me, but..."