From the manufacturer

ROCKFIGHT CE, THE ULTIMATE CHEST PROTECTOR

This isn't your typical chest protector. The Rockfight CE is a chest protector built to withstand whatever the elements throw at you. Taking our RockFight base with built in EPP that manages low speed impacts and combining it with a removable, flexible D3O back insert for hard impacts we've shattered safety standards all while keeping a slim, breathable, lightweight profile.