The Alpinestars A-4 Max Chest Protector features a CE En 1621-2:2014 Level 1 back protector and a CE EN 1621-3:2018 Level 1 chest protector. It is Alpinestars Bionic Neck Support compatible and features silicone BNS pull tabs for easy and safe engagement of the BKS. Additional thermoformed EVA tail extension provides extended coverage to the lower spine with extended padding to offer more protection against the tire roost without obstructing arm movement. Adjustable elastic straps incorporate thermoformed perforated rib protection panels for additional protection without compromising movement. The easy-to-use and quick-to-work knuckles fit a broad range of body shapes and sizes and do not restrict freedom of movement. The shoulder straps are adjustable, and the shoulder pads are removable for high levels of versatility. The A-4 Max also offers a new Alpinestars Cell Technology back protector and a triple-layer chest protector with high ventilation levels.