full modular motorcycle helmet TRIANGLE Helmets Face Flip Up Dual Visor for Adults Men and Women DOT Approved : Automotive Daytona Modular Glide Series Motorcycle

The visor aperture itself is wider than normal to give outstanding peripheral vision (in fact one owner said he had to re-calibrate his stopping markers on the track because he could see so much more!) but its also taller

However, many have evolved to include some extra features relating to organisation

(The battery maker, Darfon, is another signficant and growing player in Acers stable)

You want lots of ventilation : Compared to other aero helmets, the ventilation is average

This is largely due to directional power flow channels that create a Venturi Effect, reducing turbulence and drag while providing cooling airflow