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Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4
  • Forcefield Back Protector Pro Sub 4

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Forcefield Back Protector Pro Sub 4

The Forcefield Back Protector Pro Sub 4 is the worlds first Motorcycle back protector to transmit less than 4kn when subjected to the standard CE test.

The Pro Sub 4 has been specifically designed to test at under 4kn when subjected to the standard CE test EN1621-2. Independent testing by SATRA shows a mean test result of 3.38kn transmitted energy, making it the first motorcycle back protector in the world to attain this level of performance. Constructed with a removable and washable outer cover to give the rider the ability to keep the back protector 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 to wear, a prime consideration in the design process of any Forcefield product. As with all Forcefield Body Armour® the Pro Sub 4 has RPT (Repeat Performance Technology) ensuring continued and consistent protection even after multiple impacts. 


  • The World's first Motorcycle back protector to transmit less than 4kn when subjected to the CE test EN1621-2 (Level 2)
  • Removable and washable outer cover
  • CE Level 2 Rated Protection
  • RPT (Repeat Performance Technology)
  • Comfortable and non restrictive
  • Flexible
  • Breathable
  • Molds to body shape
  • Adjustable waist and shoulder straps
  • Multi Sport use

Read more about this product in this WebBikeWorld.com Review

Forcfield Men's Pro Sub 4 Back Protector Sizing:

Size Torso Length (in)
SM >16
MD 16.5-18.25
LG 18.5-19.75
XL 20+

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

Click here to see the full Forcefield Size Chart

Product Style RevZilla Item # Manufacturer Product # Availability
SM 617815 FPS-4-2-S In Stock: Ships next business day
MD 617816 FPS-4-2-M In Stock: Ships next business day
LG 617817 FPS-4-2-L In Stock: Ships next business day
XL 617818 FPS-4-2-XL In Stock: Ships next business day


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We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed,however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.


If your order arrives and it is not right, we will we'll fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

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Forcefield Back Protector Pro Sub 4 4.8 5 57 57
Really good!! Very true fit I mean if follow the instructions by forcefield it will work for sure! The only thing its about the lengt on the back protector. By that I mean that if your street riding with this bad boy it will probably be a little to long for your short sport jacket But seriously this thing is amazing I am a lucky guy And i didnt try it on the ground (you know) but if I have to I'm sure i'll walk back after December 14, 2015
It's protection not fun it is hard to review a protector when it has never been put to its ultimate use, so I can only rate protection based on test results and the revzilla description. It does fit nicely and the materials seem high quality. Airflow is not great, I tend to sweat under it on 85+ days - but I'm not sure that can be avoided with any serious back protector. A protector just cannot add comfort unless you are dashing, but then it will be all the inconvenience before July 6, 2015
Forgot it was there. Haven't crash-tested it, I'll leave that to others until I can't avoid it, but I like the peace of mind of top-level protection on the track. Once it was under my leathers, I didn't think about it until it was time to get out of them. It's not a distraction, and that's what's important to me. May 13, 2015
Back protector with extra features I am very happy with the purchase. I am 5'9' and bought the MD. It fit well all the way down to the tail bone. The Dianese Wave Pro in MD was a little too long but this is just right. The back protector is made up of separate layers of foam that can be removed for washing as well as customization if you had to. The hip straps have an added benefit of having some kidney protection flaps. They do not get in the way or pinch your waist skin/fat between your pants and support like some others do. Pretty comfortable under my Dainese jacket even when I'm wearing a size46. Forms well over the curvature of your back. I use this in conjunction with a Knox chest protector insert for track days. May 12, 2015
Excellent Back Protector Very light weight, comfortable and breathable. I use the shield on long day trips (about 500km) and I have nothing to complain about. Due to its flexibility, it adapts perfectly to your body shape. December 15, 2014
Excellent fit, light and very comfortable Very light weight and comfortable. Easy to adjust for fit, and relatively cool on a moderate, but long day. Fast shipping from RevZilla. Hope not to have to impact test it, so only rated average for protection and durability, though based on construction and design, I expect it will hold up very well. October 14, 2014
Vert comfortable. Fits properly Very comfortable due to it´s flexibility. Size M fits well in my 1.71 m (5´8") 65 kg body. In spite of it´s thickness it feels much more comfortable tan the Dainese thorax wave pro I am replacing . I use it combined with the Forcefield Elite chest protector and the combo works perfect together. September 2, 2014
Yet another fantastic Forcefield product I'm a tall female (5' 10") and have had a terrible time finding women's gear that fits. I've had to purchase guy's gear a few times and that has worked out pretty well. I had the women's Sport Lite L2, which is nearly the equivalent of this one, but it's way too short for my back. Also, the Pro Sub 4 is thicker - presumably due to better internal padding/protection. The Pro Sub 4 is a bit wide for my torso. Even so, it fits snug and is super comfortable in any riding position. The space for the shoulders is perfect - I have full range of motion. However, it seems like it would fit much wider shoulders, as it covers my shoulder blades, but that's had zero effect on my mobility when riding. If it's anything like the women's, it will mold well to my body over time, too. It breathes pretty well and extends from the lower C-region all the way down to lumbar. I feel protected. Haven't gone down in it yet, but I have tested Forcefield knee protectors and they saved my knee during a crash. My handlebar went down on my knee and the force of the impact separated the clip from the clutch and bent them both back in either direction flush with the bike. I walked away - bruised, but no lasting injury. Forcefield is awesome. Just wish I'd bought the guy's the first time around. July 5, 2014
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