Lazer Nut'z MIPS Helmet with Magic Buckle The MIPS (Multi-directional Impact Protection System) absorbs more rotational energy than traditional helmets Magic Buckle eliminates pinching and is super easy to fasten Patented Autofit system brings the Rollsys fit advantage to youth helmets In-Mold construction provides lightweight protection Extra fontanelle padding is soft on the top of the headKid's Uni-size fits 50-56cm