The Alpinestars SX-1 Plasma Knee Guards deliver lightweight, full-coverage protection for off-road riding, motocross, and powersports applications. Designed in a 2XL fit with a black, red, and cool gray finish, these knee protectors combine a highly ventilated semi-rigid frame with integrated Nucleon PLASMA technology for comfortable, flexible impact protection. The Alpinestars SX-1 Plasma model is engineered to remain secure while riding and support natural knee movement through a range of riding positions.
Nucleon PLASMA protection uses USDA Certified Biobased viscoelastic material that offers multidirectional pliability, adaptive comfort, and effective impact energy dissipation. The dual-density co-injected frame features scooped upper and lower extensions to help eliminate pressure points and reduce the chance of the protector digging into the skin. An integrated Dual Gear System with upper and lower gear profiles promotes smooth hinge operation, while the dual-pivot design follows natural knee articulation and helps maintain protector positioning during active riding.
The ergonomic adaptive fit uses sculpted rigid and flexible over-injected shells to accommodate a broad range of leg shapes. A rigid outer patella shell provides full knee-cup coverage through extension and helps protect against handlebar impacts. Upper and lower frames are constructed from high-performance polymer for a balance of flexibility and strength, and the slim profile supports comfortable use under riding apparel. Dual strap closures combine hook-and-loop adjustment with snap-fit buckles for a personalized, secure fit. The knee protector is certified to EN 1621-1:2012 Level 2. Manufacturer Part Number and Vendor Part Number: 6500326-1498-2X.
Features:
- Nucleon PLASMA Protection: USDA Certified Biobased viscoelastic material provides multidirectional flexibility, adaptive comfort, and impact energy dissipation.
- Dual Density Co-Injected Frame: Scooped upper and lower frame extensions help reduce pressure points and prevent the protector from digging into the skin.
- Dual Gear System: Integrated upper and lower gear profiles support smooth hinge function and natural knee articulation.
- Ergonomic Adaptive Fit: Sculpted rigid and flexible shells accommodate a wide range of leg sizes while maintaining secure positioning.
- Patella System Protection: Rigid outer shell provides full knee-cup coverage through extension and helps protect against handlebar impacts.
- Lightweight Coverage: Ventilated semi-rigid construction delivers extensive protection with a slim, ergonomic profile.
- Secure Closure System: Dual hook-and-loop straps with snap-fit buckles provide adjustable, personalized retention.
- Certified Protection: Knee protector meets EN 1621-1:2012 Level 2 requirements.