Throw on the 20 slim vest before you hit the slopes or backcountry zip in and experience protection with maximum freedom of movemennt flexible shock absorbing arg back protector shock freeze system armourgel absorbs and dissipates energy greatly reducing impact forces transmitted to the body the special structure of amourgel allows the material to absorb 80 of the impact energy air circulation system armourgel is based on an open re entrant structure allowing natural ventilation