Incorporating innovative Nucleon Flex Pro technology that is lightweight & ventilated, the Nucleon Flex family of protectors is ergonomically engineered for comfort, convenience, performance & protection. Features Slim design gives a low protector profile, meaning the protection appears discreet in the garment off the bike Adaptive design means the protector molds to the rider’s body shape for enhanced levels of comfort Construction Ergonomic design provides high levels of movement Open design structure ensures high levels of airflow & ventilation Protection The following standard applies: Level 2 EN 1621-1:2012 ...

The extremely lightweight Level 2 certified Nucleon Flex Pro-I Full Back Protector Insert features a highly ventilated hybrid of Nucleon Cell & Nucleon Flex protectors for the optimum balance of force dispersion & flexibility, with a soft-touch 3D mesh liner for enhanced rider comfort. The back protector insert is a full-length back protector, about 22% longer than regular back protector inserts. The Nucleon Flex Pro-I is compatible with all Alpinestars’ sport & touring jackets that have released since Spring 2022, as all jackets have a double pocket to insert either a regular or longer back protector insert. The goal of the Nucleon Flex Pro-I is to deliver full-length coverage in terms of protection, like a fixed back protector does, but with the practicality of an insert. Features The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes High performance polymeric material Cell & Nucleon Flex structures for optimized flexibility & excellent weight saving properties The back protector’s design changes from the center towards the outside providing the perfect balance between energy absorption & flexibility Soft comfortable 3d mesh on the body side of the protector offers breathability & rider comfort Snap button compatibility for quick & easy use with Alpinestars suits & jackets Rigorously tested & certified to T+ & T- for proven performance in extreme temperatures Protection Back Protector certified according to EN 1621-2:2014 Level 2 Hybrid Technology In terms of construction, the hybrid technology blends the best properties of Cell & Flex technologies to create an ultra-protective solution that delivers premium, breathable performance & maximum flexibility. The protector has an ergonomically contoured dual zone outer shell constructed from an advanced polymeric blend with a solid Cell structure core framed by a more flexible 3D Cell structure as the first line of defense, this is reinforced even further with the Nucleon Flex technology layer on the central back zone. The protector is backed with a breathable soft-touch 3D mesh liner for maximum airflow & optimum rider comfort.

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The extremely lightweight Level 2 certified Nucleon Flex Pro-I Full Back Protector Insert features a highly ventilated hybrid of Nucleon Cell & Nucleon Flex protectors for the optimum balance of force dispersion & flexibility, with a soft-touch 3D mesh liner for enhanced rider comfort. The back protector insert is a full-length back protector, about 22% longer than regular back protector inserts. The Nucleon Flex Pro-I is compatible with all Alpinestars’ sport & touring jackets that have released since Spring 2022, as all jackets have a double pocket to insert either a regular or longer back protector insert. The goal of the Nucleon Flex Pro-I is to deliver full-length coverage in terms of protection, like a fixed back protector does, but with the practicality of an insert. Features The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes High performance polymeric material Cell & Nucleon Flex structures for...

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The extremely lightweight Level 2 certified Nucleon Flex Pro-I Full Back Protector Insert features a highly ventilated hybrid of Nucleon Cell & Nucleon Flex protectors for the optimum balance of force dispersion & flexibility, with a soft-touch 3D mesh liner for enhanced rider comfort. The back protector insert is a full-length back protector, about 22% longer than regular back protector inserts. The Nucleon Flex Pro-I is compatible with all Alpinestars’ sport & touring jackets that have released since Spring 2022, as all jackets have a double pocket to insert either a regular or longer back protector insert. The goal of the Nucleon Flex Pro-I is to deliver full-length coverage in terms of protection, like a fixed back protector does, but with the practicality of an insert. Features The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes High performance polymeric material Cell & Nucleon Flex structures for...

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The Alpinestars NUCLEON KR-1 hybrid back protector incorporates race-oriented back protection certified Level 2 to the latest back protector standard. superb ergonomics & ventilation features make this extremely lightweight protector ideal for street or performance riding. Features Back protection certified Level 2 to the latest back protector standard revision (pr EN1621-2:2014) Featuring hard shell vertebrae protection & high energy absorbing viscoelastic memory foam, this innovative hybrid back protector is uncompromising in safety & performance Ergonomically profiled for sport riding with superb ventilation features
- the NUCLEON KR-1 is extremely lightweight & breathable
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The extremely lightweight Nucleon KR-1 CELLi insert features an articulated back shell plate for flexibility & riding fit, plus an advanced micro-structure cell design for efficient impact energy absorption & high levels of airflow.

Features: The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. High performance polymeric material blend Cell Structure for optimized flexibility & excellent weight saving properties. The back protector’s design changes from the centre towards the outside providing the perfect balance between energy absorption & flexibility. Horizontal flexion grooves for an adaptive fit in different riding positions. Soft comfortable padding on the body side of the protector offers breathability & rider comfort. Racing suit compatibility.



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The extremely lightweight Nucleon KR-1 CELLi insert features an articulated back shell plate for flexibility & riding fit, plus an advanced micro-structure cell design for efficient impact energy absorption & high levels of airflow.

Features: The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. High performance polymeric material blend Cell Structure for optimized flexibility & excellent weight saving properties. The back protector’s design changes from the centre towards the outside providing the perfect balance between energy absorption & flexibility. Horizontal flexion grooves for an adaptive fit in different riding positions. Soft comfortable padding on the body side of the protector offers breathability & rider comfort. Racing suit compatibility.



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The extremely lightweight Nucleon KR-1 CELLi insert features an articulated back shell plate for flexibility & riding fit, plus an advanced micro-structure cell design for efficient impact energy absorption & high levels of airflow.

Features: The super lightweight back protector insert is developed in three waist-to-shoulder

Dimensions in order to cover all body sizes. High performance polymeric material blend Cell Structure for optimized flexibility & excellent weight saving properties. The back protector’s design changes from the centre towards the outside providing the perfect balance between energy absorption & flexibility. Horizontal flexion grooves for an adaptive fit in different riding positions. Soft comfortable padding on the body side of the protector offers breathability & rider comfort. Racing suit compatibility.



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The NUCLEON KR-2 is an ultra-lightweight, premium adventure touring back protector certified Level 2 to the latest back protector standard revision & incorporating articulated vertebrae protection for superb performance & comfort, especially on longer rides. Features Adventure touring back protector certified Level 2 to the latest back protector standard revision (EN1621-2:2014) Extremely lightweight, highly breathable & incorporating reinforced protection this back protector is optimized for comfort on longer journeys An innovative fusion of energy absorbing viscoelastic memory foam with articulated vertebrae protection
- the NUCLEON KR-2 is flexible & ergonomically profiled for performance Features include waist adjustment for customized fit, a snap-on system to fix protector to a suit or jacket & a slim vented kidney belt for added security
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The NUCLEON KR-2 is an ultra-lightweight, premium adventure touring back protector certified Level 2 to the latest back protector standard revision & incorporating articulated vertebrae protection for superb performance & comfort, especially on longer rides. Features Adventure touring back protector certified Level 2 to the latest back protector standard revision (EN1621-2:2014) Extremely lightweight, highly breathable & incorporating reinforced protection this back protector is optimized for comfort on longer journeys An innovative fusion of energy absorbing viscoelastic memory foam with articulated vertebrae protection
- the NUCLEON KR-2 is flexible & ergonomically profiled for performance Features include waist adjustment for customized fit, a snap-on system to fix protector to a suit or jacket & a slim vented kidney belt for added security
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