Comes with a backup cap, a sleeve to complete the development and a semi-regide pouch for storage. Tested with green caps on highway and city on Buell XB12 and helmet HJC IS17. On the motorway, the sound of turbulence is significantly diminished while maintaining the environmental noise. In town, we still hear what is happening around. I have not tested with yellow caps, which should greatly reduce even more noise, but I'm afraid that the noise environment is almost restored therefore potentially dangerous, especially in cities.
