Alpinestars A-5 Plasma Chest Protector SIZES: XS/Small Medium/Large XL/2XL Anatomically profiled for all forms of off-road riding including Motocross and Supercross, the A-5 PLASMA Chest Protector features composite Nucleon PLASMA and semi-rigid thermoplastic chest and back protector shells that are engineered to be lightweight, breathable, comfortable, adaptive, and protective. The Level 2 CE certified chest and back protectors are mounted on a highly perforated 3D mesh for superior airflow and breathability. The side wings are independent from the main semi-rigid chest protector outer shell to ensure a fully adaptive fit. The Level 2 CE-certified back protector is a composite construction and has a central semi-rigid thermoplastic zone on a Nucleon PLASMA back protector for greater impact force dispersion in a critical area. Protectors have an adaptive fit that perfectly follow the body’s contours for superior comfort and freedom of movement. Nucleon PLASMA is a 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. Lightweight and highly ventilated, this knee protector offers strong impact force dispersion and absorption while ensuring maximum coverage area in all riding positions.