Forcefield Pro Sub 4K Back Protector - Black / Silver / Red

Flexible and breathable level 2 CE certified strap-on back protector reinforced with aramid fibre

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Customer Reviews for Forcefield Pro Sub 4K Back Protector - Black / Silver / Red

March 30, 2021 - by Stuart S

A must for protecting your body

After having a injury to my back I had to have faith in protecting my spine. This is a must to have as as much protection as possible. It is comfortable and I would not go out without it. Prevention is better than NO cure. I broke my Back and am lucky to ride.........

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September 6, 2020 - by Steve G

Top Class Product

Great back protector, first time l put it on, l thought this is going to be a nightmare. but after a hour or so it started to mould into your back, and don't know l had it on. it's got a top rating to, good value.

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July 21, 2020 - by David

Size M: overall well built

Although quit thick, it forms well to my torso, feeling comfortable. Straps provide good support. Am just a bit worried about how long the straps actually are going to hold. I mean it seems you cannot replace a strap but the whole protector needs be replaced. In sum am satisfied with the product and would have bought it again. It really feels secure.

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June 25, 2020 - by anonymous


Tried it on, and in first 10 or so mins, a thought it is a bit stiff, but then, it is just something light there, but completely merge with your body. True sizing, great adjustability.

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February 20, 2020 - by David H

Great Back Protector

Really well designed and supremely comfortable back protector. I have had quite a few back protectors built into jackets but this is by far one of the most protective ones I have come across. It was recommended to me by someone who's Forcefield Back Protector literally saved their life! I would never ride without it.

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February 15, 2020 - by anonymous

Feel safe

Not sure how comfy this will be in summer but so far it's been comfortable enough and I feel better knowing I'm less likely to get paralysed if I come off.

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January 10, 2020 - by anonymous

Really comfy and great quality

I wanted to get the safest back protector that I could but also one that was user friendly friendly. My riding is only for commuting and social rides and I don ride on the track etc. I ordered two to compare (Knox aegis and this one). Both were good but the fit of the sub 4k is brilliant for me as a slim 6ft tall rider the large fits like a glove and feels really secure and extends down to provide protection for my coccyx as well. It is quite thick but still fits fine under all my bike jackets. The quality is excellent and the sizing accurate.

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Press Reviews for Forcefield Pro Sub 4K Back Protector - Black / Silver / Red


Forcefield Pro Sub 4K Back Protector - Black / Silver / Red

  • Transmits less than 4kn of kinetic energy
  • Abrasion resistant aramid fibre construction
  • Removable and washable outer cover
  • CE level 2 protection, the highest possible
  • Repeat Performance Technology
  • Comfortable and does not restrict mobility
  • Flexible and breathable material used
  • Moulds to body shape for added comfort
  • Adjustable waist and shoulder straps
  • Can be used on a variety of riding styles
  • CE certified EN1621-2:2003 and EN340:2003

Forcefield Size Chart

This is the latest 2017 version, which features a colour refresh and is now reinforced with aramid fibre for abrasion resistance.

The Forcefield Pro Sub 4K was specifically designed to test at under 4kn transmitted energy when subjected to the standard CE test EN1621-2. 4kn is considered by medical experts to be the maximum amount of transmitted energy that should be subjected to a user to prevent severe back and rib trauma. Independent testing by SATRA shows a mean test result of 3.38kn making it the first motorcycle back protector in the world to attain this level of performance.

The Forcefield Pro Sub 4K back protector is constructed with a removable & washable outer cover; this gives the user the ability to keep the cover clean and hygienic. It also makes the protector more flexible as it is not bonded at the edges, this in turn makes it more comfortable, a prime consideration when Forcefield design any protector, it is know that if a protector isn't comfortable it will not be used or could be distracting and dangerous for the user.

As with all Forcefield Body Armour the Pro Sub 4K has RPT (Repeat Performance Technology) ensuring continued and consistent protection even after multiple impacts.



Forcefield Body Armour specialises in impact protection and high performance clothing systems. The brand prides itself on developing and producing cutting edge, innovative and class leading products. Winning countless awards and reviews, Forcefield continues to grow across many industries and sports. Forcefield Body Armour was launched in 2003 and is already synonymous with performance, safety and innovation; however their experience in body armour goes all the way back to 1987 when TPro became probably the first company to take body armour for sports seriously. This was further endorsed by being one of the first companies to embrace the CE mark in the early 90's.

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