Alpinestars – A-4 Plasma Roost Guard – Black/Red/White

Anatomically profiled for all forms of off-road riding | Features a semi-rigid thermoplastic polyhedron design chest protector and a Nucleon Plasma back protector that are engineered to be lightweight, breathable, comfortable, adaptive, and protective | Key Features | Highly flexible Nucleon Plasma Back Protector constructed from viscoelastic material engineered from biobased 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 protector offers strong impact force dispersion and absorption while ensuring maximum coverage areas in all riding positions | Lightweight and ultra-vented chest armor | The chest outer shells design achieves the desired structural strength and imposed load performance when compared to flat or unfaceted surfaces | The over-injected flexible side wings of the chest protector follows the body’s contours for comfort and freedom of movement | Optional Race Kit Engineered to be compatible with the Nucleon Plasma Extended Roost Coverage kit which includes Upper and Lower Chest Extensions, and an additional Y-Strap System to use the A-4 Chest without the back protector | Features highly perforated, adjustable, and detachable rib and shoulder padding for additional rib and shoulder coverage against roost and impact | Construction | Equipped with adjustable shoulder and side straps for an optimized performance fit | Removable soft tactile thermoformed shoulder padding for enhanced rider comfort | The lining on the back protector offers a soft tactile feeling against the skin while maintaining the integral structure of the protectors and reducing the risk of any material tearing | The lining is ribbed for superior airflow while also reducing the amount of material that is in contact with the skin | The perforated 3D mesh chassis also offers additional protection against tire roost | Bionic Neck Support compatibility via the BNS shoulder pull tabs | USDA certified bio-based eco-friendly and sustainable impact absorbing material