Weighing in at 1500 grams, Troy Lee Designs' SE4 Polyacrylite Helmet comes with MIPS, incorporating brain rotational protection. This helmet comes with 16 intake ports to channel cool air around and over a rider's head, forcing hot sweaty air out through six rear exhaust ports. The SE4 Polyacrylite is DOT FMVSS218 certified. MIPS brain protection system, reduces rotational forces to the brain. EPP (Expanded PolyPropylene) chin bar for lightweight, durable protection. Three shell sizes to more accurately fit a variety of head sizes and rider ages, improving overall safety.