Alpinestars A-4 Plasma Chest Protector - Black Red White - Size M/L\n\nDesigned for all off-road riding, the A-4 Plasma Chest Protector features a semi-rigid thermoplastic polyhedron design chest protector and a Plasma back protector that are engineered to be lightweight, breathable, comfortable, adaptive and protective \nKey Features\nHighly flexible Nucleon Plasma Back Protector: Constructed from viscoelastic material engineered from bio-based polymers and formed into a structure that is pliable in all directions while maintaining the ability to dissipate impact energies. \nLightweight and highly ventilated, this protector offers strong impact force dispersion and absorption while ensuring maximum coverage area in all riding positions. \nLightweight and ultra-vented chest armour: The chest outer shell \u2122s design is based on geodesic polyhedrons, and like a geodesic dome, less material is needed to achieve the desired structural strength and imposed load performance when compar;