Match that measurement (in inches or cm) towards the brand's size chart. A whole new helmet should be limited enough that the "cheek pads" make you appear like a chipmunk. They will crack in! A MIPS helmet utilizes a Multi-directional Impact Protection System to protect against head and brain harm, https://ukvisa40726.thenerdsblog.com/45813484/5-essential-elements-for-motorcycle-racing-suits