Troy Lee Designs SE4 Polyacrylite helmet comes with MIPS, incorporating brain rotational protection. This helmet comes with sixteen intake ports to channel cool air around and over a rider's head, forcing hot air out through six rear exhaust ports. 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 Anatomical 3D contoured cheekpads with emergency release system for EMS responders to easily remove cheekpads before removing the helmet Plastic visor screws and brass inserts for easy impact break away protection Stainless steel D-rings are both strong and lightweight Includes Troy Lee Designs drawstring helmet bag