If you ride everything and ride fast you need the same cool comfort and performance whether yoursquore on the open road or your favourite singletrack the giro fathom mtb helmet is a twin to the legendary atmos a breakthrough helmet design that offers amazing ventilation thanks to a clever internal reinforcement structure this giro mtb helmet features a compact design removable adjustable visor and two way adjustable roc loc 5 fit system which offer the performance and versatility you nee