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 shell’s 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