Aerostich TF3 armor explained

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The recognized benchmark for protective motorcycle gear is CE approval. If you buy a jacket from Alpinestars, Dainese, Icon or any of the other common brands, it will almost certainly have CE approved armor in the shoulders and elbows. The amazing viscoelastic TF3 armor in an Aerostich Roadcrafter isn’t CE certified, so is it safe?

Just like a Snell or ECE 22.05 sticker on your helmet, a CE certification doesn’t guarantee safety. Instead, it simply means that the piece of gear in question meets specifications and has passed a test. In this case, a test conducted by safety boffins in the European Union, it’s not a legally-required standard like DOT is for helmets. What is the test? A 5kg weight with a 40mm x 30mm striking face is dropped onto the armor in question. Armor is mounted to a 50mm radius hemispherical dome with a load cell underneath. This allows for the measurement of force transmitted through the protector. The kinetic energy of the falling mass at impact is required to be 50J. Armor that transmits less than 35kn of force passes and less force is obviously better. TF pads do pretty well here: TF2=28.71kN, TF3=25.83kN, TF4=19.83kN, TF5=19.11kN, so why don’t they meet CE standards?

Things get murky when you try to find out just what the standards are. A Google search will only give you third party results and nothing from the mythical ‘CE’ people. You would think that this should be publicly available information, but there is no official website and not even a complete Wikipedia page detailing requirements. Aerostich gives us a clue on their site though:

“TF 2-4 pads were developed years before CE standards existed to provide effective protection when fitted into our Roadcrafter and Darien Suits. When we introduced TF armor, all protective garments, including road racing suits, featured sewn-in padding made from felt, foam rubber or other less effective materials. Roadcrafters were the first rider’s garments in the world to use removable armor pad systems, and to use an advanced energy absorbing material like TF. Our armor was tested at a CE lab in England and using a duplicate test apparatus there. The CE impact standards involve both energy absorption capability and pad shape and size. Because of their shapes (not their energy absorption capabilities), Aerostich TF 2-4 pads do not match these European standards. In the hard-shelled areas, TF armor tested significantly better than most other CE approved armor. Around the softer edges, it tests lower.”

Read over the last two sentences again. What they’re saying is that for CE approval, there needs to be a larger hard-shelled area than the one they’re currently using.

If the hard shelled area isn’t large enough, it must not be safe, right? That depends. You’re much more likely to sustain a big impact at bony ends of things — shoulders, elbows and knees — than you are in the middle of your forearm, below your shoulder or on your shins. These parts are movable and their long and straight shapes have a lot more energy absorbing surface area. TF pads have a hard shell over all the pointy parts and underneath that is the TF foam that hardens under impact. The foam extends quite a bit further than the hard center shell and provides more overall coverage than traditional CE armor.

Aerostich TF3 shoulder armor vs Alpinestars Bio Armor shoulders. We’re using Bio Armor as a point of comparison because a) we had it lying around and b) we really like it.

Which one would you rather have protecting your shoulder? Elbow armor is similar, but the Alpinestars Bio Armor looks to have a slight edge over TF3, at least in length.

Aerostich TF3 elbow vs Alpinestars Bio Armor elbow.

Last, but certainly not least, is the back protector. It lacks the hard plastic plates of most modern back protectors (Forcefield is a notable exception, achieving CE level 2 in a thin package with no plates) but makes up with extra scapula and tailbone coverage.

This is an Alpinestars CE-level 2 back protector laid over the Aerostich TF3 back protector to illustrate the two protectors’ areas of coverage.

While TF3 may not be CE approved, I feel plenty safe riding around in it. The viscoelastic foam is somewhat similar to D30 in that it’s soft until something impacts it and with the aid of your body heat, easily conforms to your shape. The biggest thing to consider though is that this is real, protective armor housed in a package (the Roadcrafter) that’s convenient enough to wear everyday. You’re not gonna get tailbone, knee and hip protection wearing simply a jacket and jeans, but the ‘Stich lets you benefit from all-over protection, then zip it off in seconds so you can be in normal streetwear.

So does the lack of CE approval mean TF3 isn’t safe? Not at all. Its ability to absorb impact energy is up there with the best CE-approved armor out there, but it does differ in the coverage it offers. That peak absorption is available over a smaller area than CE likes, but overall coverage is actually larger than most CE armor. To us, that’s not a case of one being superior to the other, but rather a diverse range of options, enabling you to make informed choices about which works best for you. Knowledge is power.

  • jonoabq

    One of the things that does not get mentioned much is the performance of different armor types at the tail ends of the bell curve with regards to temperature range. The armor in the Stich’ while pliable in the more moderate temperature ranges gets stiff if not downright brittle in the 20′s(F), and by some accounts has fractured/shattered upon impact. I’ve still got it in my jacket though because nothing else fits…and I wear leathers with Forcefield inserts in the winter months.
    I’d really like to see temperature range performance of the Bio Armor if you can get your hands on it.

    • Sean Smith

      Sounds like a good excuse to take my ‘Stich snowboarding. I can bring along bio armor, TF3, TF4, Bio Armor and T-pro stuff to crash in.

    • Artful

      Give it to Wes on a cold weekend. We’ll have crash results in no time.

      • Wes Siler

        damn kids, get off my lawn.

    • T Diver

      Move to LA. (or don’t crash)

    • Sasha Pave

      I think they sell TF4 pads for low-temp, but I haven’t seen them IRL and look much different on the aerostich site:

  • Gene

    Speaking of temperature, TF4 is listed as a “low temp replacement” on their site.

    So with the even better KE results, why don’t they use TF4/TF5 by default? Is it just a lot more expensive/heavier/other disadvantage?

    • Sean Smith

      They use TF5 in the transit suit and that stuff has real CE approval. I believe it’s made by SAS tech. I have the TF5 hip pads in my roadcrafter.

      I think they don’t use TF4 because it’s thicker and slightly bulkier. I know they don’t use TF5 because it’s a different shape and intended for a completely different type of fit.

      • jonoabq

        I’ve got a SAS Tech back protector that turns into a brick when it gets cold…fantastic in the summer tho, almost as malleable as a stick of gum, completely molds to your spine.

  • Gene

    And when is Aerostich opening a shop in Daytona like Corbin did? (Yeah, I know, call the waaambulance…)

  • Raph

    Meh, show a cross-section of the T Pro force field versus both of these… Not that it means much but the T Pro Back protectors are available in CE2.

    • Sean Smith

      The T-Pro stuff is pretty amazing. I’ve got it in my Alpinestars jeans and not only does it fit incredibly well, but it crashes well too. I got knocked off my GSX-R at 20mph on the 405 a while back, landed directly on my knee and didn’t even have a bruise.

      I’m not trying to say that TF3 is the greatest thing since sliced bread, just that it’s good armor despite it’s lack of CE approval.

  • Sasha Pave

    I love the TF3 pads, but honestly they’re too bulky for my daily commute. I’ve bastardized my stich with pads raided from other gear. Nothing wrong with mix and match armor.

    • Zach

      I concur. I recently picked up a pair of Darien pants off ebay and I have lost any feel for my tank through the knees while wearing them. I figure that if I ever get stranded (on my 4 mi commute), I can fashion a nice pillow ;)

      • scott

        I did the TF5 upgrade (the Sas-Tec stuff from the Transit suit) to my Darien jacket and panth and it made a world of difference. Much less bulky. I do with I had just bought the pockets from Aerostich and the armor somewhere else as Aerostich want’s a pretty high premium for the same Sas-Tec armor you can buy pretty much anywhere.