Motorcycle Jacket Size Chart

There is no universal motorcycle jacket size, and any page that prints one table and calls it "the motorcycle jacket size chart" is making it up. Sizing is set per maker, and often per material within the same maker. The only method that works is: measure your chest properly once, write the number down, and buy against the published chart for the exact jacket you are looking at. This page shows you how to take the measurement the way makers ask for it, then walks a real published chart so you can read any of them.

We are not going to invent a generic table. What follows is Alpinestars' own published men's textile jacket chart, used as a worked example because it is typical in shape and because the same brand's leather chart is visibly different — which is the single most useful thing to understand about motorcycle sizing.

Step one: take the measurement makers actually use

Chest. Around the fullest part of your chest, under the armpits, with the tape parallel to the ground and your arms down. That last part is where most people go wrong: a tape that rides up at the back reads small, and a tape taken with your arms raised reads large. Have someone else do it if you can, breathe normally, and do not pull the tape tight.

Chest is the primary number on every motorcycle jacket chart. Most makers also publish waist, sleeve or outer-arm length and height alongside it, and those are tie-breakers rather than the decision. Measure over whatever you normally wear under a jacket — if that is a base layer, measure over the base layer.

A real published chart, and how to read it

This is Alpinestars' published men's textile jacket sizing, quoted as the maker states it. Note the bands overlap at the boundaries, which is deliberate and is where the rest of this page earns its keep.

Alpinestars publishes the full run from 2XS through 6XL with waist, arm and height columns alongside, and states plainly that the information is supplied by the manufacturer and does not guarantee a perfect fit. That disclaimer is honest and worth taking seriously: a chart gets you to the right size to try, not to a guaranteed fit.

The thing that catches everyone: leather sizes differently

Here is the part almost nobody tells you. Alpinestars sizes its leather jackets on Euro sizing, on a different set of bands — XS at 86–90 cm, S at 90–94 cm, and so on up to 6XL at 134–138 cm. Compare that against the textile chart above: a 94 cm chest sits in M on the textile chart and at the top of S on the leather one.

Same brand. Same chest. Different letter on the label. That is not an error, it is how the two product lines are built — leather is cut closer and is expected to break in and give, while textile is cut to layer over things. The practical rule is that you do not have "a size" in a brand, you have a size in a product line. Check the chart attached to the specific jacket, every time, and our leather vs textile comparison explains why the two are cut to different briefs in the first place.

Why charts differ between brands at all

Three reasons, and knowing them tells you which way to err:

1. Fit intent. A sport jacket is cut for a rider folded forward over clip-ons, with a short front and a long back and tight sleeves. A touring jacket is cut for an upright rider with room for layers. Two jackets can share a chest band and fit completely differently.
2. European versus American patterns. European makers generally cut slimmer through the chest and waist for a given chest measurement. If you are built with a broader waist than chest, that matters more than the number on the tape.
3. What the jacket expects underneath. A four-season touring shell is patterned around a thermal liner being in it. A summer mesh jacket is patterned around a t-shirt.

You are between sizes. Now what?

Overlapping bands mean this happens constantly. The honest answer depends on the jacket:

• Leather, going up in size: size down, within reason. Leather stretches across the width as it breaks in, and a leather jacket bought loose stays loose forever while the armor drifts off your shoulder.
• Textile, four-season, with a thermal liner: size up if you will genuinely ride it in winter with the liner in and a base layer under it. A shell you have to strain to close in January is a shell you will not wear.
• Summer mesh: take the smaller size. There is nothing going underneath and mesh does not give.
• If chest and waist disagree,buy for the chest and use the jacket's waist adjusters. You can take in a waist with the straps every jacket has; you cannot add room across the shoulders.

Size it with the armor you will actually wear

A jacket is sized around a body plus whatever is between the jacket and the body. If you wear a separate back protectoron a harness, or an airbag vest under the jacket, the jacket has to be sized over it — Alpinestars, for instance, advises sizing the garment while wearing a Tech-Air vest and allowing expansion room for inflation. Measuring in a t-shirt and then adding a harness protector later is how a correctly-sized jacket becomes a tight one.

The corollary matters too: a jacket that is too large fails in a way a chart cannot show you. Armor only protects the joint it is sitting over, and a loose jacket lets the shoulder and elbow pieces slide off the point of the shoulder and the point of the elbow. That is a protection failure, not a comfort complaint, and it is why our jacket fit guide walks the armor-position and displacement checks that a size chart cannot replace. Read the chart to pick the size; run those checks before you cut the tags off.

What a size chart will never tell you

• Sleeve behavior in the riding position. A sleeve that ends at your wrist standing up ends halfway up your forearm with your arms on the bars. Check it seated.
• Back length. No chest band tells you whether the jacket covers your lower back when you lean forward. This is the most common complaint about sport jackets bought by upright riders.
• Collar circumference. Broad-necked riders routinely find a correctly sized jacket closes everywhere except the throat.
• Whether the armor lands on your joints. Covered in full on our fit guide— the part of the decision that actually decides whether the jacket protects you.

The short version

Measure your chest at the fullest point with the tape level. Find the chart for the specific jacket, not the brand. Expect leather and textile from the same maker to put you in different letters. If you are between sizes, go down in leather and summer mesh, up in a four-season textile you will layer under. Then sit on the bike in it and check the armor before the tags come off. Once you have the size, our jackets ranking, armored jackets ranking and how to choose a jacket guide cover which one to buy.