Alpinestars Bionic Pro Plasma Knee Protector S/M Black/Red/White — CE Level 2, Lightweight Ventilated Off‑Road Protection

The Alpinestars Bionic Pro Plasma Knee Protector is a CE Level 2 certified, lightweight off-road knee guard that combines ventilated viscoelastic Nucleon PLASMA with dual thermoplastic shells for high abrasion resistance, impact dispersion and unrestricted movement.

Designed for aggressive trail riding, enduro and motocross, these knee protectors prioritize mobility and comfort without sacrificing certified protection. The protector uses a slip-joint construction and strategically placed hard shells to stay in position while riders bend, twist and stand on the pegs. The top elastic strap and soft inner padding help maintain a secure fit during long sessions while the ventilated chassis reduces heat buildup.

How does this knee protector balance protection and freedom of movement?

Alpinestars engineered the Bionic Pro Plasma to let riders move naturally while keeping critical areas covered. A dual-shell layout shields the patella and surrounding areas from abrasion and sliding, while the slip joint construction allows the protector to articulate with the knee.

• Two independent thermoplastic shells over the patella for sliding and impact resistance
• Slip-joint construction that preserves a snug fit during flexion
• Wide elastic top strap to lock the protector in place without restricting motion

What materials does it use to absorb and disperse impact energy?

The Bionic Pro Plasma integrates Nucleon PLASMA, a breathable viscoelastic material made from bio-based polymers, to reduce peak forces and spread impact across a larger area. That softer inner structure works with the outer hard shells so impacts are managed in layers rather than relying on a single component.

• Nucleon PLASMA core that dissipates energy and remains pliable in all directions
• Thermoplastic outer shells for added abrasion resistance and sliding performance
• Multi-layer design to combine shock absorption with surface protection

How does ventilation and comfort perform during long rides?

Ventilation and comfort are built into the chassis to limit heat and sweat buildup without adding bulk. The inner face uses soft tactile padding to reduce pressure points, while the ventilated structure and breathable fabrics encourage airflow.

• Highly ventilated chassis to improve airflow around the knee
• Soft inner padding for reduced friction and enhanced comfort
• Lightweight construction that lessens rider fatigue on extended rides

How do I size and secure the Bionic Pro Plasma correctly?

Sizing and a reliable closure are important for both performance and protection. The wide elasticated top strap provides a secure, adjustable fit, and the anatomical profiling helps the protector sit correctly over the patella while remaining comfortable in multiple riding positions.

• Anatomically profiled shape for consistent coverage across riding postures
• Wide elastic top strap for secure, customizable closure
• Removable Nucleon PLASMA insert for fit adjustment and cleaning

Who this is for: The Alpinestars Bionic Pro Plasma Knee Protector is aimed at off-road riders who demand CE Level 2 rated knee coverage that doesn’t limit movement — suitable for enduro, trail, motocross and adventure riding. Choose this pair if you want a ventilated, lightweight guard built from advanced materials that combine sliding-resistant shells with a pliable, impact-dissipating core. Riders seeking a balance of certified protection, comfort and sustained airflow will find this protector particularly useful.