Ultimate Hard Shell With Impact Foam The hard shell 5.5 Chest Protector Pro HD is lined with 3DF AirFit impact foam that is CE certified and offers chest, back, shoulder and side protection. 3D multi-layer, multi-plate articulating design that proves to be comfortable as well as keep you cool with 53 ventilation slots and works with or without a Leatt Neck Brace. Another option that offers the same protection is the 6.5 Chest Protector