This Helmet Knows When It's Too Damaged To Protect Your Head

Helmets made with a liner material called expanded polystyrene will protect your head during a ski accident, but need to replaced after the first major impact. Helmet liners made from expanded polypropylene, though, can endure multiple impacts before needing a replacement. Using a series of sensors inside its liner, POC's new Skull Orbic H.I. MIPS helmet can actually tell you when it's time to buy a new one.