Alpinestars A-4 PLASMA Chest Protector

Anatomically profiled for all forms of off-road riding, the A-4 PLASMA Chest Protector features a semi-rigid thermoplastic polyhedron chest protector and Nucleon PLASMA back protector designed to be lightweight, breathable, comfortable, adaptive and protective.

• Exceptional Comfort and Flexibility: The Nucleon PLASMA Back Protector is made from USDA-certified bio-based viscoelastic material. Designed for multi-directional flexibility, the protector molds to the body for a snug fit, effectively dissipating impact energy to provide reliable protection. Lightweight and highly ventilated, this protector provides strong impact dispersion and absorption while ensuring maximum coverage in all riding positions.
• Lightweight, Ultra-Ventilated Chest Armor: The chest's outer shell design is based on geodesic polyhedra, and like a geodesic dome, less material is needed to achieve the desired structural strength and load-bearing performance than flat or non-faceted surfaces. This results in a protector where the whole is greater than the sum of its parts, making the new A-4 PLASMA Chest Protector extremely lightweight and ventilated.
• Premium Comfort: The flexible, over-injected side wings of the chest protector perfectly follow the contours of the body for superior comfort and freedom of movement.
• Optional Race Kit: Designed to be compatible with the Nucleon PLASMA Extended Coverage kit which includes Upper and Lower Chest Extensions and an additional Y-System, allowing riders to use the A-4 Chest Protector without the back protector.
• Rib and Shoulder Coverage: The A-4 PLASMA Chest Protector features highly perforated, adjustable and removable rib and shoulder padding for additional coverage against roost and impacts.
• Compatible with BNS via the BNS elastic tabs located on the soft, removable thermoformed shoulder straps.

• According to European regulations, the CE marking is a conformity requirement for the marketing of this product. The following standards apply:
• Back protector: EN 1621-2:2014 LEVEL 1
• Chest protector: EN 1621-3:2018 LEVEL 1