Alpinestars SX-1 Plasma Knee Protector, Lightweight Off-Road Impact Protection with Articulated Design, Superior Airflow & CE-Certified MX Performance, 2XL, Black/Red/Cool Gray — Open-Box, 14% Off

CE-certified knee protector delivers high-performance impact resistance for off-road and motocross riding.

Innovative polymer and soft shell combination maximizes protection while maintaining freedom of movement.

Dual-pivot system follows natural leg motion for unrestricted mobility and consistent coverage while riding.

Strategically placed air vents and open-grid structure ensure cooling airflow during extended sessions.

Quick-release straps and ergonomic shaping provide a customizable, stay-in-place fit for all-day comfort.

The Alpinestars SX-1 Plasma Knee Protector delivers a perfect balance of lightweight comfort, ventilation, and reliable impact protection for motocross and off-road riders. Engineered using advanced materials and design technologies from Alpinestars’ racing heritage, the SX-1 Plasma provides dependable defense without compromising mobility or performance. Built from a hybrid of high-strength polymer panels and energy-absorbing soft shell zones, the SX-1 Plasma disperses impact energy while maintaining flexibility. The ergonomically sculpted shell features air-channeling openings that increase airflow to keep the rider cool, even in demanding track or trail environments. A dual-pivot hinge system allows the protector to track naturally with the movement of the knee, maintaining consistent positioning throughout riding motions. This articulation not only enhances comfort but also improves coverage, ensuring the protector stays in place during aggressive riding. Inside, soft biofoam padding conforms to the leg for an adaptive, secure fit, while adjustable hook-and-loop straps make it easy to fine-tune comfort. The open-structure design and breathable mesh zones reduce heat buildup, allowing for extended wear during long motos or enduro sessions. CE-certified to Level 1 for knee protection, the SX-1 Plasma embodies Alpinestars’ commitment to innovation and rider safety. Whether used as standalone protection or integrated into full-body armor systems, it offers race-tested durability and confidence for every ride. Engineered for those who push limits, the SX-1 Plasma Knee Protector ensures you ride with protection that performs as hard as you do.