Alpinestars A-5 Plasma Chest Protector Designed for the demands of off-road riding, including Motocross and Supercross, the A-5 Plasma Chest Protector offers a blend of Nucleon Plasma composites and semi-rigid thermoplastic for the chest and back shells. This protector emphasizes lightness, breathability, comfort, adaptability, and safety. Features: CE Level 2 certified chest and back protector rig with superior ventilation Integrated back protector reduces bulk and is extra comfy for riding ultra-light / minimal base layers Alpinestars revised Nucleon Plasma armor: Visco-elastic bio based armor Responds to impact energy and instantly goes rigid Improved ventilation Improved flex Eco-friendly Highly perforated 3D mesh for superior airflow and breathability Independent side wings for adaptive fit Back protector is a composite construction and has a central semi-rigid thermoplastic zone on a Nucleon Plasma back protector Adaptive fit protectors that contour to body movement Viscoelastic material engineered from bio-based polymers and formed into a structure that is pliable in all directions Constructed from Usda certified bio-based eco-friendly and sustainable impact absorbing material Equipped with adjustable shoulder and side straps for an optimized performance fit Removable soft tactile, thermoformed shoulder padding for enhanced rider comfort Liners on the Nucleon Plasma chest and back protectors maintain the integral structure of the protectors and reduce the risk of any material tearing Nucleon Plasma protectors are ribbed for superior airflow Perforated 3D mesh chassis also offers additional protection against tire roost Bionic Neck Support compatibility via the BNS shoulder pull tabs