This is a multilayer LEVEL 2 back armor that has optimal shock absorption without compromising comfort, ventilation, & flexibility. In case of a fall or a collision, the MEMORY FOAM layers flow individually, distributing the shock & limiting the transmitted energy to the spine & to the whole area of the back. Optimal measurements perfectly fit for all size sets: Length 44 cm (17.32 in), width 22 cm (8.66 in) Thickness 2 cm (0.8 in) Weight: 250 gr. (0.55 lb) This armor fits for those who was waist to shoulder measurements between 46-50 cm (from XS to XXL size garments). Features Four-layer back armor, made from a highly impact-resistant mixture of Nitrite & Polynorbornene rubber that ends up in a memory foam that is multi-impact rated. Designed to be positioned inside the rear pocket of any PANDO MOTO jacket or upper part protective gear. Approved, type of protection CB (central back protection)-certified according to EN1621-2:2014 standard, with the highest protection capacity: Level 2. More information