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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 Armor, the Pro Sub 4 has RPT (Repeat Performance Technology) ensuring continued and consistent protection even after multiple impacts. 


  • 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

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.

How To Measure

TL Torso Length While standing upright, measure the distance between your waist (typically at navel or top of the hip bone level) and the top of your shoulder, to the left or right of your spine.
Product Style RevZilla Item # Manufacturer Product # Availability
SM 617815 FPS-4-2-S In Stock: Ships within 24 hours
MD 617816 FPS-4-2-M In Stock: Ships within 24 hours
LG 617817 FPS-4-2-L In Stock: Ships within 24 hours
XL 617818 FPS-4-2-XL In Stock: Ships within 24 hours


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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 61 61
Great protection but not for everyday Very thick and does not have great aiflow. This should really only be used for short distances or periods of time like track days. Its too thick and air restrictive to be comfortable for an all day canyon ride. August 23, 2016
4 Years Use and Still Using it on EVERY RIDE I purchased this Forcefield Pro Sub 4 Back Protector in 2012. Still using it today having done around 35-40,000 miles. Very comfortable, moulds to the body, wear it every time I ride (street or track). It goes everywhere with me on a bike. Just bought one for my girlfriend who's now learning to ride. I've had one lowside at 40 mph in the wet, while riding a bit too fast with my mate. I have all my safety gear on and I walked away with bruising to my leg. Can't say specifically if the back protector did anything, but my back was not damaged at all. Weird benefit with the back protector is, when you crash and well-wishing people won't let you get back on your feet until the ambulance crew have arrived and checked you over.... the back protector keeps your back warm while laying on the ground... Yeah I shouldn't have crashed in the first place (My fault as I left the original 5 year old tyres on a newly purchased mint old bike). Should have listened to my gut and changed them immediately as I do know better. But you know the tread was hardly used yada yada..... May 21, 2016
Don't even feel it I purchased this back protector and the chest protector to go along with it. Just as others have stated it feels stiff at first but once you have it on it molds to your body. You forget you even have it on, not b/c it's thin but b/c it's very comfortable. April 20, 2016
Excellent protection, comfortable I highly recommend this to anybody looking for a quality back protector. Protection wise, it feels effective, but I haven't really tested it. It is thick (that's part of why it's effective), but not excessively so. It is very pliable and after a few minutes you forget you are wearing it. The covered area is larger than average and includes the tailbone, which is a definite plus, especially compared to jacket inserts. I plan on tacking it in place to the lining of my jacket, but even if you don't do this, it takes seconds to put on and take off the back protector. February 23, 2016
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
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