The Giro Women’s Register MIPS II Helmet is a well-rounded, multi discipline helmet with a removable visor, polycarbonate construction, MIPS Evolve Core Technology, and can incorporate a 4-lumen rear light and reflective rear decals for increased visibility. The Roc Loc Sport MIPS retention system lets you get a custom fit with the turn of a dial. There are 19 vents and deep internal channeling to keep you cool