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Alpinestars A-4 PLASMA Chest Protector

Anatomically profiled for all forms of off-road riding, the A-4 PLASMA Chest Protector features a lightweight semi-rigid geodesic thermoplastic chest shell and a Nucleon PLASMA back protector. Engineered to deliver high levels of breathability, comfort, adaptivity and impact protection, this system provides dependable coverage across a full range of riding positions.

Key Features
• Nucleon PLASMA Back Protector constructed from USDA-certified biobased viscoelastic material for multi-directional flexibility and impact dissipation
• Lightweight, ultra-ventilated geodesic chest shell designed for strength with reduced material weight
• Over-injected flexible side wings contour naturally to the torso for superior comfort and mobility
• Compatible with the optional Nucleon PLASMA Extended Roost Coverage Kit (upper/lower chest extensions + Y-strap) for race-ready configurations
• Adjustable, detachable and highly perforated rib and shoulder padding for extra impact and roost protection
• BNS (Bionic Neck Support) compatible via elasticated pull tabs on removable thermoformed shoulder pads
• Constructed using eco-friendly, certified biobased impact-absorbing materials
• Adjustable shoulder and side straps for a secure, performance-focused fit
• Removable soft thermoformed shoulder pads for additional comfort
• Soft-touch internal lining on back protector maintains structure while preventing material tearing
• Ribbed lining enhances airflow and reduces skin contact for improved cooling
• Perforated 3D mesh chassis provides added airflow and roost protection
• Fully compatible with Alpinestars Bionic Neck Support systems

CE Certifications
• Back Protector: EN 1621-2:2014 Level 1
• Chest Protector: EN 1621-3:2018 Level 1

Proudly supplied by DR MOTO — your trusted Alpinestars dealer, helping riders stay protected with gear we truly stand behind.