The Nucleon KR-R hybrid back protector is an innovative track & race back protector. With performance cooling, flexibility & anatomical contouring, this hybrid of hard shell & energy absorption viscoelastic memory foam is lightweight & breathable for optimized protection & comfort. Features include waist adjustment for a customized fit, a snap-on system to fix the protector to a suit or jacket & a slim vented kidney belt for added security.

Features: The Nucleon KR-R Cell is an innovative track & race back protector. Developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. The new Cell Technology back protector is constructed from a high performance polymeric material blend for optimized flexibility & excellent weight saving properties. Extended lower back protector offers more protection to the rider. Highly perforated for maximum breathability & ventilation. The ergonomically designed protector contours to the natural curve of the back ensur...



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The Nucleon KR-1 Cell back protector incorporates race-orientated back protection. Featuring hard plastic lattice structured shell, this innovative back protector is uncompromising in safety & performance. Ergonomically profiled for sport riding with superb ventilation, the Nucleon KR-1 Cell is extremely lightweight & breathable.

Features: Cell Technology back protector is constructed from a high performance polymeric material blend for optimized flexibility & excellent weight saving properties. Developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. Extended lower back protector offers more protection to the rider. Highly perforated for maximum breathability & ventilation. Horizontal flexion grooves for an adaptive fit in different riding positions. Adjustable & detachable elastic shoulder straps via a snap fit system for greater comfort. Compatible with the Nucleon KR-C protector by removing the adjustable straps. Compatible with the Nucleon KR-TB...



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The Nucleon KR-R hybrid back protector is an innovative track & race back protector. With performance cooling, flexibility & anatomical contouring, this hybrid of hard shell & energy absorption viscoelastic memory foam is lightweight & breathable for optimized protection & comfort. Features include waist adjustment for a customized fit, a snap-on system to fix the protector to a suit or jacket & a slim vented kidney belt for added security.

Features: The Nucleon KR-R Cell is an innovative track & race back protector. Developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. The new Cell Technology back protector is constructed from a high performance polymeric material blend for optimized flexibility & excellent weight saving properties. Extended lower back protector offers more protection to the rider. Highly perforated for maximum breathability & ventilation. The ergonomically designed protector contours to the natural curve of the back ensuring an optimum fit while riding. Horizontal flexion grooves for an adaptive fit in different riding positions. Compatible with the Nucleon KR-TB protector for extended lower spine protection. Height adjustable kidney belt featuring dual hook & loop closure system for easy, secure closure. Soft Bio-Foam padded chassis for maximum comfort.



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The Nucleon KR-1 Cell back protector incorporates race-orientated back protection. Featuring hard plastic lattice structured shell, this innovative back protector is uncompromising in safety & performance. Ergonomically profiled for sport riding with superb ventilation, the Nucleon KR-1 Cell is extremely lightweight & breathable.

Features: Cell Technology back protector is constructed from a high performance polymeric material blend for optimized flexibility & excellent weight saving properties. Developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. Extended lower back protector offers more protection to the rider. Highly perforated for maximum breathability & ventilation. Horizontal flexion grooves for an adaptive fit in different riding positions. Adjustable & detachable elastic shoulder straps via a snap fit system for greater comfort. Compatible with the Nucleon KR-C protector by removing the adjustable straps. Compatible with the Nucleon KR-TB...



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Features a lightweight & easy to use back protection extension for the lowest part of your spine (coccyx). Can be fitted on: KR-1 KR-R KR-2 ...

Highly ventilated for superior airflow & breathability, with a soft-touch inner liner on the skin side for optimum rider comfort. The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. 60 years of innovation & extensive testing & research have resulted in Plasma Technology, the perfect balance between impact force absorption, density, thickness & pliability. The adoption of Nucleon Plasma Technology allows Alpinestars to tailor the geometry throughout the protector, resulting in extensive perforations while still far exceeding the impact performance requirements of the CE Standards. Another standout feature of this design is the extensive number of lateral & longitudinal ventilation channels for effective heat dissipation. The Nucleon Plasma Back Protector Insert’s innovative design allows the protector to compress & extend on itself which delivers an ultra-adaptive fit for superior rider comfort. Fea...

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Highly ventilated for superior airflow & breathability, with a soft-touch inner liner on the skin side for optimum rider comfort. The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. 60 years of innovation & extensive testing & research have resulted in Plasma Technology, the perfect balance between impact force absorption, density, thickness & pliability. The adoption of Nucleon Plasma Technology allows Alpinestars to tailor the geometry throughout the protector, resulting in extensive perforations while still far exceeding the impact performance requirements of the CE Standards. Another standout feature of this design is the extensive number of lateral & longitudinal ventilation channels for effective heat dissipation. The Nucleon Plasma Back Protector Insert’s innovative design allows the protector to compress & extend on itself which delivers an ultra-adaptive fit for superior rider comfort. Fea...

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Highly ventilated for superior airflow & breathability, with a soft-touch inner liner on the skin side for optimum rider comfort. The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. 60 years of innovation & extensive testing & research have resulted in Plasma Technology, the perfect balance between impact force absorption, density, thickness & pliability. The adoption of Nucleon Plasma Technology allows Alpinestars to tailor the geometry throughout the protector, resulting in extensive perforations while still far exceeding the impact performance requirements of the CE Standards. Another standout feature of this design is the extensive number of lateral & longitudinal ventilation channels for effective heat dissipation. The Nucleon Plasma Back Protector Insert’s innovative design allows the protector to compress & extend on itself which delivers an ultra-adaptive fit for superior rider comfort. Fea...

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Anatomically profiled for all performance road riding & racing, the Nucleon Plasma Racing Chest Protector Insert has been engineered to be lightweight, breathable, comfortable & protective, & features a composite semi-rigid thermoplastic central zone on the outer for additional impact performance. Features Specifically engineered for use with all Alpinestars racing suits The Level 2 certified chest protector insert is a composite construction & has a central semi-rigid thermoplastic zone on a Nucleon Plasma chest protector for greater impact force dispersion in a critical area The innovative Plasma M design delivers maximum airflow & heat dissipation The soft tactile backing guarantees structural integrity of the protector by preventing any potential tearing Fully adaptive design for maximum comfort Extended side wings for greater coverage & protection of the ribs Silicone ribbing on inner side to prevent slipping & ensure the protector remains in place Fully customizable... ...

Anatomically profiled for all performance road riding & racing, the Nucleon Plasma Racing Chest Protector Insert has been engineered to be lightweight, breathable, comfortable & protective, & features a composite semi-rigid thermoplastic central zone on the outer for additional impact performance. Features Specifically engineered for use with all Alpinestars racing suits The Level 2 certified chest protector insert is a composite construction & has a central semi-rigid thermoplastic zone on a Nucleon Plasma chest protector for greater impact force dispersion in a critical area The innovative Plasma M design delivers maximum airflow & heat dissipation The soft tactile backing guarantees structural integrity of the protector by preventing any potential tearing Fully adaptive design for maximum comfort Extended side wings for greater coverage & protection of the ribs Silicone ribbing on inner side to prevent slipping & ensure the protector remains in place Fully customizable... ...