Alpinestars Nucleon KR Celli Protector back protector

Technical sheet

Alpinestars Nucleon KR Celli Protector back protector

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19 Reviews

17 Questions

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Long

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Features of Alpinestars Nucleon KR Celli Protector

Product description of Alpinestars Nucleon KR Celli Protector back protector

Description summary

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

Features:

- Horizontal flexion groves for an adaptive fit in different riding position.
- Soft comfortable airmesh on the body side of the protector offers maximum breathability and rider comfort.

Construction:

- The triple segmented back shell plate is constructed from a high performance polymeric material blend for optimized flexibility and excellent weight saving properties.
- Unique cell micro-structure designed for advanced energy absorption, adaptivity, maximum breathability and air flow.

Protection:

- Back Protection – EN 1621-2:2014 Level 1.
- The ultra-lightweight Nucleon KR-CELLi Protector insert is developed in three waist-to-shoulder dimensions to cover all body sizes.
- The back protector’s structure design and structural change from center towards the outside provide the perfect balance between force dispersion and energy absorption.
- Ergonomic protection plate contours to the natural curve of the back ensuring optimum fit while riding.

Specifications

Manual

Technical specifications of Alpinestars Nucleon KR Celli Protector

Certifications

CE EN1621-2 Level 1
Protection level

Level 1
Coverage type

Back Only
Ventilation system

High Levels Of Airflow
Color

Black
Product Type

Back protectors
Location

Back

Features of Alpinestars Nucleon KR Celli Protector

Color Black

Color

Black

Product Type Back protectors

Product Type

Back protectors

Location Back

Location

Back

Key differentiators

CE EN 1621-2 Level 1 certified for impact protection.

Constructed from a high-performance polymeric material blend for flexibility and weight savings.

Engineered with high ventilation and a soft airmesh liner for maximum breathability and rider comfort.

Features a unique cell micro-structure designed for advanced energy absorption.

Triple-segmented, articulated back shell with horizontal flexion grooves for an adaptive fit.

Technology in Alpinestars Nucleon KR Celli Protector back protector

Energy rating

Warnings

5 / 5

19 Reviews

What our customers are saying about Alpinestars Nucleon KR Celli Protector back protector

This Alpinestars back protector is praised for its perfect fit in compatible jackets. The slim, non-bulky design is comfortable and discreet. It´s an extremely lightweight, flexible, and breathable back protector, making it ideal for long rides. The high-quality construction features a honeycomb design for excellent ventilation and sturdy, protective padding. A top-rated, comfortable, and non-restrictive upgrade for your riding gear

Alpin start protections

2026/06/27

Santiago

Excellent product. The wait was worth it, original elements and super compatible with the jacket

Alpinestars Nucleon KR Celki Protector

2025/07/04

Peter

Fits exactly the pouch on A-stars jacket. Everything is as expected.

Perfect

2025/04/09

Thomas

Fits perfectly and does not add bulk to the back

Alpinestars sempre!

2024/12/15

Fernando Costa

The usual product, at a good price so you don't have to change protections between coats!

Great product

2024/11/23

TUT

High quality and good finish. Recommended!!

Great product

2024/11/23

TUT

High quality and good finish. Recommended!!

I got what I ordered

2024/05/09

Pete

The product met expectations and the delivery was quite fast.

good

2023/12/20

meric yuksel

best budget back potector

Good and comfortable

2023/04/23

Fran

Ideal complement to the Alpinestars sweatshirt to be protected but discreetly consistent with the sweatshirt, comfortable, discreet and breathable.

Top quality and price

2023/04/23

Elio G. Ronzoni

I bought several protections for different Alpinestars size M garments. The protector is light, ventilated and soft, although protective even on long journeys it is comfortable. Excellent workmanship and attention to detail, recommended. Shop chosen several other times for other products, prices are always the most competitive online, shipping is always very fast. Recommended shop.

Good and light

2023/04/19

David

Quite light and good ventilation. I have one of those in my urban jacket and a L.2 in my leather jacket. They are non restrictive and comfortable. This one is for my wife’s jacket. For those interested, the protector fits into a Dainese pouch, but with s slight modification to the lining. Dainese protectors are bulkier and more expensive.

What i expected

2023/02/02

Juan

Good quality and fair price

Alpinestars nucleon kr celli protector

2023/01/30

LUIS FILIPE

I bought the size M protector for a size M Alpinestars Andes v3 jacket as well. The protector doesn't bother you, it's light and malleable enough to be comfortable on long trips. Very good quality, I highly recommend. As for the store it was the cheapest price online I found and the shipping was very fast, delivered to the door the next day. I recommend both.

Excellent product

2022/10/13

Sergio Carrasco

Excellent product, very light, the padding is very soft, the vents are very good, the size is ideal.

Review

2021/12/14

Sergei

Good back protection. lightweight breathable

Very Comfortable

2021/08/24

Igal Rozenberg

Great product. breathable yet sturdy. Very Comfortable. Loved it.

Alpinestars Nucleon KR Celli Protector 護背

2020/04/12

賈斯伯

蜂巢式設計，很輕又具有不錯的保護效果，完美安裝於自家防摔衣，讚！跟防摔衣褲一起訂購約一個半月收到。

Alpinestars nucleon kr celli protector

2020/02/01

Vítor Rodrigues

Fantastic product, excellent quality and light weight. I recommend this product and this store.

Thank You Team!

2020/01/24

Arunava Ganguly

A Big Thank You to the team and I loved the product too!!

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Include AI Generated questions and answers

2026-09-13

Generated by AI and verified

What are the main benefits of the Alpinestars Nucleon Kr Celli Protector?

Answer of Generated by AI and verified

The Alpinestars Nucleon Kr Celli Protector offers a combination of protection, flexibility, and comfort. It features a unique cell micro-structure designed for advanced energy absorption and high levels of airflow. Its triple segmented back shell plate, made from a high-performance polymeric blend, provides optimized flexibility and excellent weight-saving properties, while the ergonomic design ensures an optimum fit while riding.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

Is the Nucleon Kr Celli back protector breathable?

Answer of Generated by AI and verified

Yes, this protector is designed for high levels of airflow. It features a unique cell micro-structure that promotes ventilation and has a soft, comfortable airmesh on the body side to offer maximum breathability and rider comfort.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

What material is the Nucleon Kr Celli protector made from?

Answer of Generated by AI and verified

The protector's triple segmented back shell plate is constructed from a high-performance polymeric material blend, which is engineered for optimized flexibility and to save weight.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

Is the Alpinestars Nucleon Kr Celli Protector worth buying for motorcycle riders?

Answer of Generated by AI and verified

The Alpinestars Nucleon Kr Celli Protector is a CE EN 1621-2 Level 1 certified back protector, offering advanced impact energy absorption and high breathability, making it a valuable choice for safety-conscious motorcycle riders.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

What safety certification does the Nucleon Kr Celli protector have?

Answer of Generated by AI and verified

This back protector meets the EN 1621-2:2014 Level 1 standard for back protection.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

What level of protection does this back protector offer?

Answer of Generated by AI and verified

The Alpinestars Nucleon Kr Celli Protector provides Level 1 impact protection, as certified by the EN 1621-2:2014 standard.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

Is this back protector flexible?

Answer of Generated by AI and verified

Yes, the protector is designed to be flexible. It features an articulated back shell plate and horizontal flexion grooves that allow for an adaptive fit in different riding positions.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

What is the certification level of the Alpinestars Nucleon Kr Celli Protector?

Answer of Generated by AI and verified

The Alpinestars Nucleon Kr Celli Protector is certified to CE EN 1621-2 Level 1, ensuring a high level of safety and impact resistance.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

Is this protector suitable for different riding positions?

Answer of Generated by AI and verified

Yes, it is designed for an adaptive fit. The inclusion of horizontal flexion groves helps the protector conform to your back as you change riding positions, ensuring it remains comfortable and correctly placed.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

How does this protector enhance rider comfort?

Answer of Generated by AI and verified

The protector enhances comfort through several features. It is extremely lightweight and incorporates a soft, comfortable airmesh on the side facing your body for maximum breathability. Its flexible, ergonomic design also contours to the natural curve of the back for an optimal fit while riding.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

Is the Alpinestars Nucleon Kr Celli Protector suitable for long rides?

Answer of Generated by AI and verified

Yes, the Alpinestars Nucleon Kr Celli Protector is designed with high breathability and comfort, making it suitable for long rides by providing consistent airflow and comfort.

* Generated by AI based on customer and product data

2026-09-13

Generated by AI and verified

How does the Alpinestars Nucleon Kr Celli Protector compare to the Alpinestars Nucleon Plasma Back Protector?

Answer of Generated by AI and verified

While both products are designed for motorcycle safety, the Nucleon Kr Celli Protector features an articulated back shell plate for flexibility and a high-performance polymeric material blend, which may offer enhanced comfort and adaptability.

* Generated by AI based on customer and product data

2024-12-03

BAS

Hello, I have the Alpinestars RADIUM TECH Motorcycle Sweat Jacket - Black / White, in size L. Does the back protector combine well with this jacket? and what size should I take for the back protector? Thank you for your answer

Answer of Yonatan

This protector will fit your jacket properly. U should order L size

* Generated by AI based on customer and product data

2024-01-12

Gleison Vilmes

What are the compatible protectors for the Bogotá PRO Jacket?

Answer of Meriç

The elbows and shoulders are equipped as standard with CE level 2 approved Nucleon protectors

Answer of Riccardo

Excellent for the jacket I got: alpinestar AST v2 in size M

* Generated by AI based on customer and product data

2024-07-24

ricardo

Greetings, I would like to know if this protector can be used with my track motorcycle suit. If not, please recommend one from your page, thank you.

Answer of Meriç

Hi u can use with all Alpinestars jackets.

* Generated by AI based on customer and product data

2024-12-04

Eva

Hello, I need to know if it is compatible to adapt it to the Alpinestars 3103518TI jacket

Answer of Novák

Hello, I've got an Alpinestars T-SPS Air jacket. it fits well and comfortable to wear. size L both.

* Generated by AI based on customer and product data

2025-10-11

Carlos Antonio

Good evening, I have an Andes V3 jacket in size M. Can I use a size L nucleon for greater protection? Or would it be too big? Thank you.

Answer of Bruno

I have an LS2 jacket size M and I had to return the L.

* Generated by AI based on customer and product data

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Frequently bought together

Best sellers

Use cases

Street Riding & Daily Commuting 90% Fit

Its flexible construction and high ventilation make it a solid choice for daily street riding and urban commuting, providing reliable protection without sacrificing comfort on regular journeys.

CE EN 1621-2 Level 1 Certification,High Ventilation,Flexible Construction

Motorcycle Touring 80% Fit

Designed for rider comfort, this protector's high airflow and soft airmesh are well-suited for long-distance touring, helping to manage temperature and reduce fatigue over extended periods.

High Airflow Design,Soft Comfortable Airmesh,Ergonomic Fit

Spirited Canyon or Weekend Riding 75% Fit

For enthusiastic weekend rides, this protector offers a balanced blend of CE Level 1 certified impact absorption and flexibility, allowing for dynamic movement while providing a great level of safety.

CE EN 1621-2 Level 1 Certification,Triple Segmented Back Shell Plate,Flexible Polymeric Material Blend

Track Day & Novice Racing 50% Fit

While it offers certified protection, this Level 1 protector is a limited choice for racing. It's acceptable for introductory track days, but dedicated racers typically require the higher impact absorption of a Level 2 protector.

CE EN 1621-2 Level 1 Certification,Impact Energy Absorption

Best for

Ideal for Riders

Certifications: CE_EN_1621-2 (Level 1), Protection level: level_1

Great for Regular Commuters & Weekend Riders

With its high ventilation and flexible design, this protector provides certified safety without sacrificing the comfort needed for regular, extended use.

Ventilation system: high, Flexibility: flexible

A Solid Upgrade for Riders

This protector combines a high-performance polymeric material blend with excellent breathability, offering a reliable upgrade for those seeking more than just entry-level gear.

Material: polymeric material blend, Ventilation system: high

Benefits

FunctionalCertified Impact Protection for Your Ride

Ride with confidence knowing your spine is protected. This back protector is constructed from a high-performance polymeric material blend and features a triple segmented back shell plate designed for efficient impact energy absorption, meeting CE EN1621-2 Level 1 certification standards.

Certifications: CE_EN_1621-2 (Certifications: CE EN1621-2 Level 1)

Ideal buyer profiles

The Rider

This rider prioritizes certified protection above all else. They research safety standards and choose gear that offers reliable impact absorption for every ride, whether it's a daily commute or a weekend trip.

The triple segmented back shell plate is constructed from a high-performance polymeric material blend with an advanced cell micro-structure designed for efficient impact energy absorption, directly addressing the need for reliable spinal protection.

Ideal Buyer

The enjoys spirited rides on weekends and seeks gear that balances performance, comfort, and protection. They need equipment that can handle longer hours on the bike without causing overheating or restricting movement.

This product is ideal for the due to its focus on comfort and ventilation. The design features high levels of airflow and a soft airmesh on the body side for maximum breathability, ensuring comfort during extended rides. Its flexible construction and ergonomic fit provide protection without feeling restrictive.

Competitive features

When selecting a back protector, key considerations include the level of certified protection, comfort during a ride, and how well it adapts to your body's movements. The Alpinestars Nucleon Kr Celli Protector is a CE-certified Level 1 insert designed for flexibility and airflow. We'll analyze how its features stack up against other popular options in the same category, such as the Alpinestars Nucleon Plasma, T-ur Easyflex 3in1, and Zandona Airnet Xs.

Where it excels

The Nucleon Kr Celli Protector is constructed with a unique cell micro-structure and a triple-segmented back shell plate, a design focused on providing a blend of flexibility, advanced energy absorption, and high levels of airflow. It features horizontal flexion grooves, which are specifically designed to allow the protector to offer an adaptive fit across different riding positions, enhancing comfort and movement. Comfort is further addressed with a soft airmesh on the body side of the protector, which aims to maximize breathability for the rider.

Consider alternatives if...

Verdict

The Alpinestars Nucleon Kr Celli Protector is a strong contender for riders seeking a lightweight, flexible, and highly breathable back protector insert. It offers EN 1621-2:2014 Level 1 protection, making it suitable for general road riding. Its design, featuring a polymeric material blend and articulated plates, prioritizes an adaptive fit and rider comfort through efficient airflow. While the provided data doesn't highlight specific areas where competitors have a distinct advantage, this protector stands out for its focus on combining protection with flexibility and ventilation.

Specs comparison

	Alpinestars Nucleon KR Celli Protector back protector	Alpinestars Nucleon Flex Proi Back Protector	Alpinestars Nucleon Plasma Back Protector	Alpinestars Nucleon Plasma Full Back Protector
Material	polymeric material blend	-	bio-based materials and high performance polyurethane	bio-based materials and high performance polyurethane
Ventilation	Yes	Yes	Yes	Yes
Flexibility	flexible	-	flexible	flexible
Impact Protection	Level 1	Level 2	Level 2	Level 2
Used For	motorcycles	motorcycles	motorcycles	motorcycles
Protection Level	Level 1	Level 2	Level 2	Level 2
Coverage Type	Back Only	Back Only	Back Protector Insert	Full Back Protector Insert

Specs vs competitors

	Alpinestars Nucleon KR Celli Protector back protector	Zandona Shield Evo X3 Back Protector	Zandona Shield Evo X4 Back Protector	Zandona Shield Evo X5 Back Protector	Revit Seesoft Air Back Protector	Zandona Airnet M Back Protector
Material	polymeric material blend	-	transpiring and anti-bacterial material	transpiring and anti-bacterial material	Nitrile and Polynorbornene rubber	thermoplastic
Ventilation	Yes	Yes	Yes	Yes	Yes	Yes
Flexibility	flexible	-	-	-	flexible	flexible
Impact Protection	Level 1	Level 1	Level 1	Level 1	Level 2	Level 2
Used For	motorcycles	motorcycles	motorcycles	motorcycles	motorcycles	motorcycles
Protection Level	Level 1	-	Level 1	Level 1	Level 2	Level 2
Coverage Type	Back Only	Back Protector	Back Only	Back Only	Back Insert	Back Protector