Alpinestars
Alpinestars Nucleon Flex Pro Back Protector Insert
Item: #919129 | Part Number: Not Selected$121.95 - $144.99
Description
The Alpinestars Nucleon Flex Pro Back Protector Insert delivers top-level impact protection in a slim, flexible design built for comfort and long rides. CE-certified Level 2, it adapts to your body shape while maximizing ventilation with a ventilated, rubberized polymer construction.
Alpinestars Nucleon Flex Pro Back Protector Insert Item # 919129
Description
Top-performing impact absorption, extremely ventilated, flexible and comfortable. These armors from Alpinestars keep you safe in all conditions.
Construction:
- Slim design makes the protector discreet off the bike
- Adaptive design fits to different body shape for maximum comfort
- High density of air vents for better ventilation and airflow
- Made from rubberized polymer blend
- No pressure points for long-distance riding
Protection:
- CE-certified as Level 2 to EN 1621-1:2012
Features:
- Ergonomic design that allows high levels of movement
- Shaped in a vertically-tapering manner
Part Numbers for Alpinestars Nucleon Flex Pro Back Protector Insert
Reviews
Rated 5 out of
5
by
Leon from
Good back protector
Fit perfectly in my t sp x superair jacket. Hopefully i'll never test it but I feel safer.
Date published: 2025-04-28
Questions
Does this fit the alpinestars missile v1 ? For the v2 it is ok but i need to know for the V1
The Nucleon Flex Pro is compatible with all Alpinestars’ sport and 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.
Date published: 2024-08-29
Does this fit the alpinestars missile v2 ignition leather jacket? If so, what size do I need for a 56EU size jacket?
Yes, this will fit inside the missile v2 ignition leather jacket. According to the size chart for a 56 EU you'd need the large.
Date published: 2024-07-04
What is the main difference's between this full back protection insert and Plasma?
Here are the main differences between the Alpinestars Nucleon Flex Pro Full Back Protector Insert and the Nucleon Plasma Full Back Protector Insert:
The Nucleon Flex Pro features a hybrid design using Nucleon Cell and Nucleon Flex materials for an optimal balance of force dispersion and flexibility. It's full-length, highly ventilated, and compatible with all Alpinestars jackets from Spring 2022 onward.
The Nucleon Plasma uses eco-friendly, bio-based materials blended with high-performance polyurethane for enhanced adaptability, superior airflow, and sustainability, with a focus on breathability and comfort.
Flex Pro uses Cell and Flex technology for protection and flexibility, while Plasma is designed around eco-friendly materials and maximum ventilation.
Date published: 2025-11-06
Alpinestars T-GP Plus R V3 Air Jacket I have xl jacket so what size protector should I get
You need a Medium sized protector.
Date published: 2025-02-13
What size for back protection for a large halo jacket
Medium should work just fine.
Date published: 2023-09-20
Checking to see if this will fit my 3XL Alpinestar Bogota Drystar Pro jacket? And if it does, what size should I purchase?
Yes, you will need a size large.
Date published: 2026-01-06
Does this protect the coccyx as well?
It should offer protection down to the tailbone, but as everyone has a different body type and different length torso, it's difficult to say for certain.
Date published: 2023-10-12
Dos this fit an alpinestars core leather jacket?
Yes, this will fit inside an Alpinestars Core Leather Jacket.
Date published: 2024-03-11