Guides

Key takeaways

• The thin foam pad that ships in many jackets is usually not a certified back protector. If it doesn't say EN 1621-2 on the label, it's a comfort pad, not protection.
• Level 2 back protectors transmit an average of under 9 kN. Level 1 transmits under 18 kN. Even Level 1 back armor is tested to a tighter limit than Level 2 elbow and knee armor (20 kN).
• FB covers your spine and shoulder blades, CB covers the central spine only, and LB covers the lower back only.
• Size a back protector by waist-to-shoulder length in centimeters, not by your jacket size.
• Many track days now require one. Back protectors have been mandatory at Motorsport Vision's UK track days since 1 March 2022.
• Replace a back protector after a significant impact. For example, Knox says not to use its protectors more than five years after purchase.

What is a motorcycle back protector?

A motorcycle back protector (also called a spine protector or back armor) is a padded or shell-and-foam panel that sits over your spine. In a crash it absorbs and spreads impact energy when your back hits the ground, a kerb, a barrier or your own bike. It either slips into a pocket inside your jacket or race suit, or it straps on separately with shoulder straps and a waist belt.

A good back protector covers the muscles and bony ridges along your spine and the back of your ribs. Longer protectors also cover your lower back.

What it can't do: back protectors are tested against direct, blunt impacts, such as landing flat on your back or sliding into a kerb. They can't stop the twisting, over-bending or crushing forces behind many serious spinal injuries. A back protector lowers the force of an impact. It doesn't make any crash safe.

Do you really need a back protector?

For most riders the answer is yes, for three reasons:

1. Your jacket probably doesn't have one. Many jackets and some suits ship with a thin foam "back pad" in the rear pocket. Take it out and check it. If it has no CE label showing EN 1621-2, it's a placeholder, not protection.
2. It's a cheap upgrade. A certified insert costs a fraction of the price of a good jacket or suit, adds very little weight and protects one of the most important parts of your body.
3. Track days increasingly demand it. More and more organizers won't let you on track without one (see track day rules below).

The riders who benefit most are sport and track riders, commuters (low-speed falls onto kerbs and car bumpers are common) and adventure riders who ride over rocks.

CE back protector ratings explained (EN 1621-2:2014)

Motorcycle back protectors are tested to the European standard EN 1621-2:2014. In the test, the protector is hit with a 50-joule impact, about the same as dropping a 5 kg (11 lb) weight from one meter. A sensor underneath measures how much force gets through. The lower the transmitted force, the better the protection.

Protectors are tested at room temperature and after wet (hydrolytic) aging, so they still have to perform when they're soaked with sweat or rain. Manufacturers can also add two optional tests: hot (+40°C / 104°F, marked T+) and cold (−10°C / 14°F, marked T−).

EN 1621-2 level	Average transmitted force	Maximum single strike	Who it suits
Level 1	Under 18 kN (≈ 4,050 lbf)	24 kN (≈ 5,400 lbf)	Minimum certified protection: casual commuting where low bulk matters most
Level 2	Under 9 kN (≈ 2,020 lbf)	12 kN (≈ 2,700 lbf)	Recommended for everyone, and strongly recommended for sport riding, track days and racing

How back armor compares with other CE armor

The back is held to much stricter limits than your limbs. A Level 1 back protector is tested to a lower force limit than Level 2 elbow or knee armor:

Body area	Standard	Level 1 (average)	Level 2 (average)
Back / spine	EN 1621-2:2014	Under 18 kN	Under 9 kN
Shoulders, elbows, hips, knees	EN 1621-1:2012	Under 35 kN	20 kN or less
Chest	EN 1621-3:2018	18 kN or less	Same, plus a force-distribution test (15 kN or less)

To learn how limb armor is rated, read our guide to CE Level 1 vs Level 2 armor.

How to read a back protector label

A genuinely certified back protector carries a printed or sewn-in label with:

• The CE mark and the motorcyclist pictogram
• The standard: EN 1621-2:2014 (older stock may show the earlier 2003 version)
• The performance level: 1 or 2
• The type: FB (full back), CB (central back) or LB (lumbar/lower back)
• The size, given as a waist-to-shoulder length in centimeters
• T+ and/or T− if it passed the optional hot and cold tests
• The manufacturer's name and model reference

If any of these are missing, treat the pad as uncertified.

Types of motorcycle back protectors

By coverage: FB, CB and LB

Type	What it covers	Best for
FB: Full back	Spine from upper to lower back, plus the shoulder blades	Track days, racing, sport riding, anyone who wants maximum coverage
CB: Central back	A central strip over the spine, with no shoulder-blade protection	Narrow, lighter protection that fits snug jackets
LB: Lumbar back	Lower back only, with no upper-back protection	An add-on, not a main back protector for road or track

By how it's worn

• Insert: slides into a dedicated pocket in your jacket or race suit. It's comfortable and convenient, but it can only be as big as the pocket and only stays in place if the garment fits snugly.
• Strap-on (standalone): worn under your jacket or suit with shoulder straps and a waist belt. It stays centered on your spine whatever the jacket does, and it often covers more of your back. It's warmer, and it's one more thing to put on.
• Armored vest or base layer: combines back protection with chest (and sometimes shoulder) protection in one garment.
• Airbag systems: inflatable protectors are certified to a different standard, EN 1621-4. Many riders wear them alongside a back protector, not instead of one (more below).

By material

• Soft, rate-sensitive foams (D3O, SAS-TEC and similar): flexible and comfortable, and they shape to your back while riding, then stiffen on impact. Some are affected by temperature, so check for T+ and T− markings if you ride in very hot or cold weather.
• Hard shell over foam (articulated plates): a rigid outer shell spreads point loads such as rocks or kerb edges over a wider area. These protectors are bulkier and warmer.
• Perforated and honeycomb designs: holes or open cells let air through, which makes a big difference in summer and on track.

How to size a motorcycle back protector

EN 1621-2 back protectors are sized by waist-to-shoulder length, not by S/M/L clothing size or by your height. Here's how to get it right:

1. Get into your riding position. Wear the base layer you ride in and sit on your bike (or on a stool, leaning as you would on the bike). Your back gets longer when you lean forward, so a sportbike rider measuring while standing straight will choose a protector that's too short.
2. Measure along your spine from your waist (your belt line, around the top of your hip bones) up to the top of your shoulders. Ask someone to help, because it's impossible to do accurately on your own.
3. Compare with the brand's size chart. Manufacturers define the measuring points slightly differently, so use the method shown on that brand's chart.
4. For an insert, measure the pocket too. The protector should fill the pocket without folding, bunching or sliding around inside it.
5. If you're between sizes, try both in your riding position. Choose the longest one that doesn't push into your helmet when you tuck or dig into the seat or your hips.

Ordering a made-to-measure suit? Our custom suit measuring guide covers every measurement we need, including back length.

How should a back protector fit? A 5-point check

1. Top edge: it sits just below the base of your neck and doesn't push your collar into your helmet when you look up in a full tuck.
2. Bottom edge: it reaches down to your belt line or toward your tailbone, but doesn't hit the seat when you're sitting on the bike. On track, aim for shoulders-to-tailbone coverage.
3. Centered and stable: it stays on your spine when you twist, reach for the bars, and shift side to side as you would in a corner.
4. Close to your body: there's no gap between the protector and your back in your riding position. If your jacket is baggy, the armor can move away from the spot it needs to cover. That's one big reason a properly fitted suit matters.
5. Shoulder blades covered if you chose an FB type.

Note: the "speed hump" on a race suit is not back protection. It's there for aerodynamics (and, on some airbag suits, to house parts of the system). You still need a certified protector underneath.

Insert vs strap-on back protector: which should you choose?

	Insert (pocket)	Strap-on (standalone)
Coverage	Limited by the pocket size	Often longer and wider
Stays in place	Only as well as your jacket or suit fits	Yes, strapped to your body
Heat and comfort	Cooler and less to wear	Warmer, with an extra layer
Convenience	Always in your gear	One more item to put on
Track day rules	Accepted by many organizers, but not all	Widely accepted
Best for	Riders in a well-fitted suit or jacket	Riders who move between jackets, or whose track day requires a separate protector

Back protectors at track days and races

Gear rules are set by each track day organizer or racing club, so always read the tech rules before you book. Two examples show where things are heading:

• UK: from 1 March 2022, Motorsport Vision (MSV) made back protectors compulsory at its motorcycle track days. The minimum is a full-length, CE-approved protector covering most of the spine, either built into your suit or worn separately, and marshals check it in pit lane.
• North America: rules vary by club, and some are stricter. For example, the Westwood Motorcycle Racing Club in Canada requires a separate CE Level 2 back protector that extends from the shoulders to the tailbone, and states that soft back pads sewn into suits do not meet the requirement.

If your organizer requires a separate protector, take the insert out of your suit and wear a strap-on underneath. Going to your first track day? Use our track day gear checklist.

Back protector vs airbag vest: do you need both?

A back protector is passive: it's always there and needs no charging or triggering. An airbag (EN 1621-4) inflates in a fraction of a second during a crash and, depending on the design, can protect your chest, back, ribs and neck.

They work best together. Many airbag vests include a back protector panel or are designed to be worn over one, and plenty of track riders run both. If you can only buy one thing today, a certified Level 2 back protector is the cheaper, simpler first step.

Should you add a chest protector too?

Back protection covers half of your torso. If you ride on track or ride hard on the road, a chest protector certified to EN 1621-3 is the logical next upgrade. Level 1 chest protectors must transmit an average of 18 kN or less. Level 2 adds a force-distribution test (15 kN or less on average), so the protector has to spread a blow across your chest rather than pass it through in one spot. Many inserts fit into chest pockets in jackets and suits, and some vests combine chest and back protection.

How to care for a back protector, and when to replace it

Care

• Take the protector out of your jacket or suit before you clean the garment.
• Unless the label says otherwise, hand-wash it in lukewarm water with a little mild soap, rinse well and air-dry it flat, away from radiators and direct heat.
• Never tumble-dry it, and don't leave it in a hot car or in direct sun for long periods.
• Store it flat or inside the hanging garment, not folded or crushed under heavy items.

Cleaning your leathers at the same time? Follow our guide on how to clean and condition a racing suit.

Replace your back protector if:

• It has taken a significant impact in a crash, even if it looks fine. Damage to the foam can be invisible.
• You can see cracks, splits or permanent dents, or the foam has hardened, crumbled or stays compressed.
• It's past the manufacturer's service life. Knox, for example, tells riders not to use its protectors more than five years after purchase. Check your own brand's manual.
• It no longer fits, because your body or your riding position has changed.

7 common back protector mistakes

1. Assuming the foam pad that came in the jacket is a certified back protector.
2. Choosing a protector by jacket size instead of waist-to-shoulder length.
3. Measuring standing up straight instead of in your riding position.
4. Buying a CB (central back) protector when you wanted your shoulder blades covered.
5. Wearing it in a loose jacket that lets the protector slide away from your spine.
6. Keeping a protector that has already absorbed a big crash.
7. Arriving at a track day without checking whether the organizer requires a separate protector.

How we build back protection into Bleed race suits

Every armor package we fit in our leather race suits uses CE Level 2 protection in every body area, including a ventilated back protector certified to EN 1621-2:2014. Our Premium package uses KeepTech's full-length Part-269 back protector, about 40 × 44 cm. Our armor is tested and certified by Ricotest (Notified Body No. 0498) under Regulation (EU) 2016/425. You can read the full details on our Protection & Safety page.

Because our suits are made to your measurements, the leather holds the armor close to your body, and that's what keeps a back protector over your spine when it counts. Still deciding on a suit style? Compare 1-piece vs 2-piece suits or kangaroo vs cowhide leather.

Frequently asked questions

Is a motorcycle back protector worth it?

Yes. A CE Level 2 back protector costs a fraction of the price of a jacket or suit, adds little weight, and is tested to let through an average of under 9 kN in a standard 50-joule impact. It won't prevent every spinal injury, but it reduces the force of direct blows to your back from the ground, kerbs or your bike.

Is CE Level 1 back protection enough for street riding?

Level 1 is the minimum certified standard and far better than an uncertified foam pad. But Level 2 lets through half the average force (under 9 kN vs under 18 kN), and modern Level 2 inserts are thin and flexible, so Level 2 is the better choice for most riders.

What is the difference between a back protector and a spine protector?

Usually there's no difference: "back protector", "spine protector" and "back armor" are used for the same product. What matters is the label. A genuine motorcycle back protector is certified to EN 1621-2 and shows its level (1 or 2), type (FB, CB or LB) and size.

Can I wear a back protector under my motorcycle jacket?

Yes. Strap-on back protectors are designed to be worn under a jacket or race suit, held in place by shoulder straps and a waist belt. Take any foam pad out of the jacket's back pocket first, and make sure the jacket still closes comfortably without pushing the protector out of position.

How do I know if the back pad in my jacket is a real protector?

Take it out and look for a label printed on it or sewn to it. A certified protector shows the CE mark, EN 1621-2, Level 1 or 2, the type (FB, CB or LB) and a size in centimeters. A plain foam pad with no markings is a placeholder, not certified protection.

How long does a motorcycle back protector last?

Follow the manufacturer's service life. Knox, for example, says not to use its protectors more than five years after purchase. Replace any protector sooner if it has taken a hard impact, or if it's cracked, split or permanently dented, or its foam has hardened or crumbled.

Can I use a ski or mountain-bike back protector for motorcycling?

Only if it's certified to EN 1621-2, the motorcycle back protector standard. Many winter-sports and mountain-bike protectors carry this certification, so check the label for the standard, level, type and size before you rely on it on the road or track.

Can a back protector prevent paralysis?

No piece of armor can guarantee that. A back protector is tested against direct, blunt impacts and helps absorb and spread that force. It can't stop the twisting, over-bending or crushing forces behind many serious spinal injuries. It reduces your risk; it doesn't remove it.

Do I need a back protector for a motorcycle track day?

Increasingly, yes. Motorsport Vision made back protectors mandatory at its UK track days from 1 March 2022, and some North American clubs require a separate CE Level 2 protector running from the shoulders to the tailbone. Check your organizer's gear rules before you book.

Sources

• SATRA Technology: EN 1621 motorcyclists' protectors: test overview
• iTeh Standards: EN 1621-2:2014 back protectors and EN 1621-3 chest protectors
• Visordown: 2022 UK track day rule change: back protectors made compulsory
• Westwood Motorcycle Racing Club: track day gear requirements
• Knox: care and maintenance of body armour