The Forcefield Upgrade back protector inserts are designed to replace existing back protector inserts & comply with the EN1621-2: 2003 Level 1 standard. With Nitrex® a unique high-tech shock-absorbing material, energy can be scattered & absorbed, & evenly distributed over the Nevertheless, the protector is flexible & comfortable. The materials used can withstand repeated impacts. A combination of technology & Multi Nitrex layers allows Forcefield to manufacture more lightweight & flexible protectors. This allows the body to move without being restricted. The unique triangular Nitrex grids have been designed to allow breathing holes at the base for breathability, & this also reduces weight. Features Approved to: EN1621-2: 2003 Level 1 Protector strength: 15.5 mm