Troy lee designs a2 mips helmet 5050 bluethis a2 helmet from troy lee designs redefines mtb style safety ventilation and comfort this is the first mountain bike helmet to combine eps and epp fast and slow speed impacts into one lustrous package powerful cooling efficiencythe huge air intakes are 25 larger than tlds a1 helmet and are connected to enormous exhaust ports through deep internal channels to ensure powerful cooling efficiency this helmet is also equipped with mips a patent