Designed to provide premium ventilation, the Alpinestars Stella SMX Air Jacket features a Tech Mesh chassis with additional stretch and 450D poly-fabric perforated in critical areas for lightweight yet ultra-durable construction. A new inner construction allows for the Alpinestars Nucleon protection inserts and has a pocket for a long back protector (sold separately). It is CE certified to CE Category II EN 17092-4:2020 - A class with CE Level 1 EN1621-1:2012 Alpinestars Nucleon Flex Plus Level 1 shoulder and elbow armour. It is Tech-Air ready (sold separately) with strategic stretch inserts at the side of the torso and upper back panel for excellent freedom of movement/ The ergonomic design gives optimal sports movement, and flexibility and waist adjusters allow for the perfect fit. It comes with a detachable windproof liner and has a watertight compartment to protect your essentials. DFS Lite external shoulder protectors give additional impact protection.