Armour protects the area it is covering at the moment of impact, and nothing else. MotoCAP, the Australian government-backed gear rating programme, states the principle in its published test protocols, version 1.3, July 2024: an impact protector with high energy attenuation will be ineffective if it is incorrectly located or can be displaced away from the areas exposed to impact injury. That is why their rating scores three separate things — how much force the protector transmits, how much of the critical area it covers, and how far it can be pushed off that area — rather than just the first. You can run a simplified version of the same assessment at home in ten minutes, in your riding position, and it will tell you more about your jacket than the label does.
The four reference points
MotoCAP's assessors measure from four defined body landmarks: the point of the shoulder, the point of the elbow, the point of the hip bone and the point of the knee. Those are the places impact energy arrives, and everything about positioning is measured relative to them.
Their baseline requirement is blunt about what has to be there at all. Impact protectors must be present in the high-risk region their protocol calls Zone 1 in all garments; jackets must be fitted with protectors at the shoulders and elbows; trousers must be fitted at the hips and knees; one-piece suits at all four. If required protectors are missing and no pockets are provided for aftermarket ones, the garment's impact protection score is zero out of ten regardless of how good the remaining protectors are. If the pockets exist but are empty, it scores one out of ten. Those are the two most common configurations sold in shops.
The size of the protector is scored separately from its performance, using the Type B template defined in BS EN 1621-1:2012. MotoCAP allows coverage to be scored up to 150 per cent of that template — deliberately, to reward protectors that are larger than the minimum. Bigger genuinely is better here, provided it still sits in the right place.
Testing your own gear the way they do
MotoCAP's buying guidance gives the consumer version in one line: try the gear on and check that protectors remain securely positioned over your shoulders, elbows, hips and knees, and that the garment is snug and comfortable in your normal riding position. Two conditions there do the work — "remain" and "in your normal riding position".
Do it in this order. Put the gear on over what you would actually ride in, not over a jumper you own for the shop visit. Find each landmark by pressing through the garment with a fingertip: the bony corner at the top of the shoulder, the point of the elbow with the arm bent, the bony lump on the side of the hip, the centre of the kneecap. Note where the protector edge is relative to each.
Then adopt the riding position — ideally sitting on the bike, hands on the grips — and check the same four points again. This is where knee protectors reveal themselves, because trousers ride up when you sit and a knee pad that was central standing up can end up above the kneecap seated.
Finally, do the displacement test. Take hold of the fabric around each protector and push and pull it as hard as you reasonably can, the way a road surface would drag it. MotoCAP scores how much of the critical area remains covered by the maximally displaced protector, and the answer for a loose garment is often "almost none". A protector you can slide entirely off the joint by hand will slide off in a crash.
| Joint | Landmark | Correct position | Common failure |
|---|---|---|---|
| Shoulder | Bony corner at the top of the shoulder | Protector centred on the corner, extending down the upper arm | Sits inboard toward the neck on an oversized jacket, or down the bicep on a small one |
| Elbow | Point of the elbow, arm bent | Centred on the point with the protector extending down the forearm | Sits above the elbow when the arms are forward on the bars |
| Hip | Bony lump on the outside of the hip | Protector over the side of the hip, not the front of the thigh | Pocket sewn too far forward; pad ends up on the quad |
| Knee | Centre of the kneecap, seated | Covers the kneecap and extends below it down the shin | Rides above the kneecap the moment you sit on the bike |
| Spine | Base of the neck to top of the pelvis | Flat against the spine over the whole length | Insert floats away from the back inside a loose jacket |
The specific failures, and how to fix each one
Knees are the worst offender by a wide margin, because trousers move more than jackets and the joint travels furthest between standing and riding. Three fixes work. Buy trousers with height-adjustable knee pockets, which most decent brands now offer — set them seated, not standing. Use trousers that fit at the waist so they cannot ride up as a whole. Or fit a longer protector that covers enough of the shin that a small migration still leaves the kneecap covered.
Shoulders fail from jacket sizing. A jacket bought a size up for winter layering, then worn over a t-shirt in July, puts the shoulder protectors somewhere between the neck and the bicep and lets them wander freely. Sleeve and bicep adjusters help; a jacket that fits in summer and takes a thin insulated layer in winter helps more than one bought oversized in the first place.
Elbows fail because riders check them with their arms hanging down. On a bike your elbows are forward and bent, and a protector centred with the arm straight often sits behind the joint when you reach the bars. Check bent, and note MotoCAP's positioning rule taken from EN 1621-1: the protector is located with its larger area at the body reference point and the remainder extending distally down the limb, away from the torso. Forearm coverage is intentional, not spare material.
Hips fail silently because nobody looks. Sit on the bike and press for the bony lump on the outside of your hip. If the pad is on the front of your thigh, the pocket is in the wrong place for your build, and the practical answer is different trousers rather than a different pad.
Spine protectors are covered separately in the guide to choosing a back protector, but the same displacement logic applies: an insert in a loose jacket pocket moves, and a harness that straps to your body does not.
Connecting the pieces, and what it costs you
The single most effective anti-migration device on a motorcycle is the zip that joins jacket to trousers. It stops the jacket riding up your back and stops the trousers riding down, which fixes hip position and back protector position at the same time. It is also the feature riders most often ignore because connecting the two takes an extra fifteen seconds.
After that: waist adjusters set tight enough to hold, sleeve and bicep adjusters closed, calf zips done up, and a jacket that is snug across the chest and shoulders rather than comfortable to slouch in.
All of this has a cost, and it is worth being honest about it. Gear that holds armour in place is closer-fitting, warmer in summer, more restrictive when you are walking around off the bike, and less able to swallow thick layers underneath. Riders who buy for comfort at a standstill end up with armour that floats. Riders who buy for a track fit end up with gear they resent on a hot afternoon. The workable compromise is a fit that is snug in the riding position with the layers you actually wear, then adjusters used properly rather than left slack.
Two related things to sort out at the same time. Check that every protector pocket contains something marked to the standard rather than plain foam — MotoCAP's impact protector ratings exist precisely because unmarked fillers are common, and the level and type markings are explained in the guide to CE armour levels. And if you wear an inflatable garment, remember it has its own fit requirement in the opposite direction, needing room to expand — see the guide to how airbag vests work.
If you are fitting out a passenger, positioning is the whole problem rather than part of it, because adult-cut gear puts shoulder protectors halfway down a smaller person's arm. That case is covered in the guide to carrying a child pillion. And whatever your gear does or fails to do, a front and rear camera system gives you the record of the incident afterwards, which is the one piece of evidence armour cannot provide.
Frequently asked questions
How do I know my armour is in the right place?
Put the gear on over your normal riding layers, sit on the bike in your riding position, and press through the fabric to find the bony landmarks at the shoulder, elbow, hip and knee. The protector should be centred on each one. Then push and pull the garment to see how far the protector can be displaced.
Why does my knee armour move when I sit down?
Because trousers ride up when you bend your knee. Set height-adjustable knee pockets while seated rather than standing, keep the trousers held at the waist, and consider a longer protector so that a small shift still leaves the kneecap covered.
Is a bigger protector better?
Generally yes, provided it stays in position. MotoCAP allows coverage to be scored up to 150 per cent of the reference template specifically to reward protectors larger than the minimum, because more of the joint stays covered even if the garment moves.
Should I connect my jacket to my trousers?
Yes. The connecting zip is the most effective single measure against the jacket riding up and the trousers riding down, and it corrects hip and back protector position at the same time. It takes seconds and most riders skip it.
My jacket is comfortable but loose. Is that a problem?
If the protectors can be slid off your shoulders and elbows by hand, yes. Loose gear also flaps, distracts and lets cold air through. Use the waist, bicep and sleeve adjusters, and if a jacket cannot be adjusted to hold the armour on the joints, it is the wrong size.
