Safety is our #1 focus and concern at 509. With the development of the Altitude helmet we put an emphasis on safety & quality. First is the dual density internal EPS foam. This provides two innovative levels of crash absorbing protection. Next is our industry leading thermoplastic poly alloy outer shell that provides a high level of puncture prevention. The Altitude breathbox was redesigned from the ground up. It features a slim & sleek profile that allows the breath box to be worn underneath or on top of your 509 goggles. The breathbox installs/removes in seconds and can be custom formed to fit your specific face profile.