• Free UK DeliveryMainland ex H'lands (over £25)
  • Free Returns*Mainland UK over £25
  • Click & CollectFrom a shop near you
  • 365 Day ReturnsRefund or exchange
  • Award WinningMCN retailer of the year
  • 15+ Years OnlineTried, tested, trusted

Free UK Delivery

It's really simple, if you spend over £25 with us, delivery is free of charge to any mainland UK address (excluding Islands & Highlands).

Free Returns*

We now offer free returns on any UK Mainland order (excluding Highlands) over £25. Most importantly, returning an item to us is super simple. Just click here or on the 'create a return' link located at the bottom of every page, and create your return in under 1 minute. You can choose from any UPS Access point close to you where you can drop off your return at a time convenient for you.

Click & Collect

If you can't be around to receive your delivery during the day, just use one of our simple click & collect options. We offer delivery to a shop local to you using both the UPS Access Point network and the DPD Pickup network. Most pick up points are open outside of normal working hours and will keep your package so you can collect at a time to suit you.

365 Day Returns

We simply don't believe in making the sale and moving on, we want to make sure our customers are happy with their purchase. That's why we now offer a full 365 day returns period. Simply relax, take your time and make sure it's right! All we ask is that you try the items within your own home and return with the tags intact.

Award Winning

There's a reason why our competitors spend so much time watching what we do, we believe in customer service levels beyond the norm and we're always looking for ways to improve. In late 2013 we were recognised for this by the bike industry's No.1 publication, Motorcycle News. As retailer of the year, we feel it's our duty to constantly better our offering and if you have any ideas, we'd love to hear from you!

15+ Years Online

We've been serving the motorcycle community for more than 15 years now and in that time we've grown to be the largest online retailer of motorcycle clothing & accessories in the UK.

Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens

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in Body Armour

Nucleon chest protector insert for Alpinestars clothing

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Customer Reviews for Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens

Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
April 18, 2019

Armoured chest.

Chest insert for my Alpinestars Atem jacket. Initially I was put off by the sizing as I could only get extra small. Through some research the extra small size was the recommended size for my medium jacket. These are a perfect fit and cover the chest well. A little tricky to insert into the jacket but they are light well ventilated and mould well to the chest. Why wouldn't you buy these? Delivery first class as usual.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
February 17, 2019



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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
December 12, 2018

Very adaptable.

You don't know that these are there once inserted into the jacket, whilst substantial they are also very flexible with no uncomfortable edges.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
September 25, 2018

Good ventillation

I used in light summer jacket and it was perfect to wear on hot days.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
July 23, 2018

Perfect, unobtrusive protection

Fits perfectly into my EU48 leather jacket and you hardly know they're there. Really pleased.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
June 6, 2018


Fit into pocket perfectly, far better than flimsy padding supplied as standard.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
May 22, 2018


Exactly what they say they are and the jacket is still very comfortable with them in.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
May 5, 2018

Great brand

I just wanted to be prepared for the worst and I didn't check how it works but the same like all the products I buy from Alpinestars is for me fantastic.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
March 2, 2018

Hope I never need to test them

Fits well. Much better than the foam padding you get as standard on Astars stuff ...

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens
December 31, 2017

For your A stars jackets - leathers

Best fit, ordered Small to avoid bulkiness, 48 jacket, 50 suit size.

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Alpinestars Nucleon KR-Ci Chest Protector Insert - Mens

  • Impact and vibration protection upgrade
  • Optimized to fit compatible Alpinestars jackets
  • Super slimline profile
  • Perforated for improved breathability


Alpinestars, a truly world class brand of motorcycle apparel. Founded in the early 1960s by Sante Mazzarolo, Alpinestars has grown to be a world leading manufacturer of professional racing products such as leather jackets, jeans, boots and 1 piece suits. Whilst their leathers are worn by some of the biggest names in bike racing, they also specialise in high performance textile jackets, jeans and gloves. From F1 to Karting, the World Rally Championship to NASCAR, Alpinestars work with the very best drivers and riders to bring design innovations to all aspects of professional motor-sport.

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Questions and Answers

Questions and Answers

  • Will these inserts fit into a Motegi leather jacket?

    June 19, 2018

    Yes, I can confirm these do fit the jacket.

  • will these fit in gp plus r leather jacket thanks

    May 28, 2018

    Yes, this will fit.

  • Are these inserts CE level 1 or 2?

    March 22, 2018

    These inserts are certified to prEN 1621-3:2013 and are not regarded as level 1 or 2.

  • How do you fit these chest protectors to the Managua jacket? Cant find my way into the pockets for the inserts.

    November 13, 2017

    Access is through the zip at the bottom of the jacket - hook and loop fasteners hold the chest inserts in place directly behind the inside pockets.

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