The impact foam is flexible for a comfortable fit yet instantly transforms into a hard, energy absorbing substance to protect you during a crash. For high impact or stone deflection, the hard shell areas are made of high density poly ethylene (HDPE). The chest protector offers chest, back, shoulder and flank protection and scores a total of 17 points in the Leatt protection system.The 3D and multi-layer, multi-plate design promises a comfortable fit – and your Leatt neck brace will integrate comfortably with the protector. It is further also ventilated with ventilation slots that provide maximum airflow. For a slightly higher level of protection, take a look at the 5.5 Pro HD Chest Protector which has a score of 20 points.