The Snowpulse base frame is the foundation of the Snowpulse Switch System. It has been designed for the quick, easy and affordable interchange of the different pack covers: 15L, 30L, 45L and Highmark. The Base Frame contains all the functioning components of the airbag system: the airbag, cylinder and ripcord. This year the shoulder straps are lower profile, which provides more room for your helmet. On the waist band there is a new accessories pocket and the buckle has been improved to a simple, yet effective freeze-proof, aluminium, quick-release system. .