Tech-Air® 5 Airbag System. As the SMX Air Jacket has been designed to provide premium ventilation, the jacket also comes with a detachable windbreaker liner to help reduce airflow when it’s not needed, offering optimal climate comfort and versatility. DFS Lite external shoulder sliders paired with Nucleon Flex Plus CE Level 1 shoulder, elbow, and forearm armor together provide impact protection for the SMX Air Jacket, resulting in a CE level A rating overall. Derived from Alpinestars’ MX DNA, the highly ventilated, SMX Air Jacket is the perfect choice for the everyday commuter and weekend rider looking for a versatile and protective street sport jacket for riding in warm climates. SMX Air Jacket