Bell XR MIPS Solid Road, Gravel & Trail Cycling Helmet | MIPSThe Bell XR MIPS Solid is the entry point into Bell's XR range delivering the same all terrain riding versatility and MIPS rotational protection as the Spherical model, at a more accessible price point. It's the helmet for riders who want genuine safety credentials and real world versatility without stepping up to Spherical Technology. MIPS is an independently validated low friction layer inside the helmet that allows approximately 1015mm of movement