Premium Hard Shell Chest Protector with 3DF AirFit Soft Impact Foam. The 4.5 Chest Protector is CE tested and certified as impact protection for the chest, back and flank areas. It sports a 3D multi-layer and multi-plate articulating design that ensures a good, comfortable fit. What makes it so effective as a chest protector is the use of 3DF AirFit ventilated soft impact foam. Even though it conforms to your body�s shape, it absorbs energy upon impact. The hard shell areas are made of made of high density poly ethylene (HDPE) for high impact or stone deflection. The 4.5 Chest Protector scores a total of 12 points in the Leatt protection system. For a slightly higher level of protection, you can take a look at the 4.5 Pro Chest Protector which scores 17 points for protection.