These jackets are sold in US based “alpha” sizes. Alpinestars publishes a super-complicated size chart which can be used to pick a size based upon your chest and waist. We’ve condensed their chart down to make it easy to read (see below).
This jacket is a sport cut, which is designed to fit snug and close to the body. We tried a size Medium and XL on our fit check mannequins Huey and Dewey fit good and look good, but they don’t have much extra room.
If you like a very trim fit, then you’ll like this style in the size you normally wear in men’s clothing, but if you prefer a more “American” fit or you are between sizes, I’d recommend you choose a size larger than you usually wear. And since this jacket has a pretty trim fit, you’ll also want to check your belly (if you have one) and make sure the jacket size you pick is big enough for your mid-section as well as your chest.
Note: If you plan to add back or chest armor you’ll need to add to your measurements before selecting a size from the chart. Add 1” to your chest and back measurement for a back protector and another inch to your chest for a pair of chest protectors.
| Jacket Size | Chest Range | Waist/Belly Range |
|---|---|---|
| Small | 37.5 to 39 | 32 to 36 |
| Medium | 40 to 42 | 35 to 39 |
| Large | 42 to 44 | 37 to 41 |
| XL | 44 to 46 | 39 to 43 |
| XXL | 47 to 49 | 42 to 46 |
| XXXL | 49 to 51 | 43 to 47 |
| XXXXL | 51.5 to 53 | 45 to 49 |