Airbag vs Armour in Riding Gear: What Each Does

Armour and an airbag protect against different things. Armour is a passive layer that is always in place: it spreads and cushions an impact at the shoulders, elbows, hips, knees and back. An airbag is an active system that inflates around the torso when a crash is detected, so it only helps once it has deployed. Neither replaces the other, and neither replaces an abrasion-resistant outer layer such as leather.

What armour does

Motorcycle armour is a shaped pad, usually foam or a similar energy-absorbing material, that sits in pockets inside a jacket, suit, trousers or glove. Its job is to reduce the force that reaches the body when a rider hits the ground or an object. Because it is a fixed part of the garment, it works from the first moment of a crash and needs no power, sensor or trigger.

The European standard for limb protectors is EN 1621-1. SATRA, a testing body, describes it as the test used to assess the protective qualities of armour worn on the limb joints. It has two levels: Level 1 requires a mean transmitted force below 35 kN (no single value over 50 kN), and Level 2 limits the mean to below 20 kN. Back protectors are covered separately by EN 1621-2, and chest protectors by EN 1621-3.

Armour only protects the area it covers, and only if it sits in the right place. A loose jacket or a suit that shifts on the body can leave a shoulder or knee pad away from the joint it is meant to cover. That is why fit matters as much as the armour itself, whether it is fitted in a one-piece race suit or in a riding jacket.

What an airbag does

An airbag system packs a folded bag into a vest, jacket or suit. When a crash is detected, gas fills the bag and it expands around the chest, ribs, shoulders and often the back and neck, spreading the load over a larger area. Airbag vests for horse riding used a cord that triggered inflation when it was pulled in a fall, while modern motorcycle systems use onboard sensors (accelerometer, gyroscope and GPS) and a computer that decides when to inflate, as described on Wikipedia.

Speed of inflation is the key variable. MotoGP.com describes the airbags in its riders' leathers as inflating within 0.045 seconds of the start of a crash, and as protecting the chest, shoulders, ribcage, upper back and neck. That figure is for the racing systems it describes; it is not a promise for any other vest or garment.

An airbag also has built-in limits. It cannot help in a crash it fails to detect, it covers mostly the torso, and it does not protect hands, feet or legs. Whether it can be reused after deploying depends on the system, so the maker's instructions apply.

How each is tested

Both technologies sit in the same standard family but are judged on different things. According to SATRA, EN 1621-4 covers inflatable protectors, with two performance levels: Level 1 for protectors designed to give adequate protection, and Level 2 for items that give more protection than Level 1. Because inflation speed is critical, inflation is analysed with a high-speed camera recording at least 200 frames per second.

A standard describes what a tested protector must do in the laboratory. It says nothing about any particular jacket or suit unless that product carries its own documentation. When a listing mentions armour or a standard, check the product page for the armour it lists, and ask for the documentation.

Why the outer layer still matters

In a slide, the first thing that touches the road is the outer material. MotoGP.com notes that riders choose leather for its resistance to abrasion, since sliding on asphalt generates heavy friction and heat. Armour sits under the material and an airbag sits around the torso, so neither one stops skin being scraped away on the limbs and hands.

This is why cowhide garments such as a leather motorcycle racing suit are usually paired with armour rather than treated as an alternative to it. For everyday riding, the same logic applies to a waterproof leather motorcycle jacket : leather is chosen for abrasion resistance, and armour is a separate matter. The product page lists CE armour on the elbows and no other armour, so a rider who wants shoulder or back protection should ask the maker about it and request the documentation.

Choosing the right mix

The answer depends on how and where a rider rides. A few questions help narrow it down:

• Is the garment already fitted with armour pockets? Many jackets and suits have them. Confirm the armour option before ordering.
• Is there room for an airbag? Vests worn under or over a jacket change the fit, so the outer layer needs enough room.
• Are hands and legs covered? An airbag does not replace gloves, trousers or boots.
• Will the rider wear it every ride? Protection that stays in the closet does nothing.

Hands need their own protection too, so motorcycle gloves belong in the plan. Riders who want a garment cut to their measurements can look at custom motorcycle jackets . The product page describes a made-to-measure fit and lists CE-level armour among its add-ons, so confirm with the maker which armour applies to an order and ask for the documentation.

Written by the Leather Collection Editorial Team.