Alpinestars A-4 Plasma Roost Deflector

Alpinestars A-4 Plasma Roost Deflector – Lightweight Motocross Chest & Back Protector

Designed for serious off-road riders, the Alpinestars A-4 Plasma Roost Deflector delivers advanced impact protection, lightweight comfort, and maximum ventilation—helping you ride harder with confidence. Whether you're tackling motocross tracks, enduro terrain, or technical trails, this roost deflector enhances safety while maintaining the mobility needed to control your powersports vehicle.

The A-4 Plasma combines a semi-rigid thermoplastic chest protector with a flexible Nucleon Plasma back protector, creating a hybrid protection system that’s both durable and adaptive. The polyhedron chest design increases structural strength while remaining lightweight and highly ventilated, ensuring optimal protection without added bulk.

At the rear, the Nucleon Plasma back protector uses a biobased viscoelastic material that stays soft and flexible during movement but absorbs and dissipates impact energy when needed. This allows for natural movement while maintaining critical protection in high-impact zones.

Built for comfort and airflow, the A-4 Plasma features ultra-vented armor and a perforated 3D mesh chassis, promoting cooling airflow during intense rides. The over-injected flexible side wings contour to your body for a secure, comfortable fit that moves with you.

For added versatility, the system includes adjustable shoulder and side straps, detachable rib and shoulder padding, and compatibility with optional extended roost coverage kits. It's also designed to integrate with Alpinestars Bionic Neck Support (BNS) systems for enhanced upper-body protection.

Key Features & Benefits:

• Hybrid Chest & Back Protection System: Combines semi-rigid chest armor with flexible Nucleon Plasma back protection.
• Advanced Polyhedron Chest Design: Enhances strength and load distribution while remaining lightweight.
• Nucleon Plasma Back Protector: Biobased viscoelastic material absorbs and disperses impact energy.
• Highly Ventilated Construction: Maximizes airflow to keep riders cool during aggressive riding.
• Flexible Side Wings: Conforms to body shape for improved comfort and mobility.
• Adjustable & Customizable Fit: Shoulder and side straps ensure a secure, performance-oriented fit.
• Detachable Rib & Shoulder Padding: Adds extra protection where needed.
• BNS Compatibility: Integrates with Alpinestars neck support systems for added safety.
• Optional Extended Coverage Kits: Expand protection with additional chest and strap components.
• Black/White/Red

Why Choose the Alpinestars A-4 Plasma Roost Deflector?

The Alpinestars A-4 Plasma Roost Deflector is built for riders who want lightweight, breathable protection without sacrificing performance. Its hybrid design provides targeted impact protection and superior airflow, helping reduce fatigue while increasing confidence on the track or trail.