
These jackets are sold in US based “alpha” sizes, so selecting a size is basically pretty easy. For most people, you would choose the size you normally wear in men’s clothing. 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). The waist is adjustable with Velcro tabs. Overall this should be a very easy style to fit. I would say the size chart shows what you can tighten the jacket down to using the adjustment straps, and you can probably fit another 2 inches or so even with the liners installed if the adjusters are fully released.
The max waist of a jacket style like this is only a couple inches smaller than the max chest, so the style is very forgiving in case you have a bit of a belly, but don’t be concerned if your belly is smaller than the size listed below because this jacket has some very effective side waist adjustment straps.
Jacket Size | Chest Range | Waist/Belly Range |
---|---|---|
Small | 37.5 to 39 | 37 |
Medium | 40 to 41.5 | 39.5 |
Large | 42 to 43.5 | 41.5 |
XL | 44.5 to 46 | 44 |
XXL | 47 to 49 | 47 |
XXXL | 49 to 51 | 49 |
XXXXL | 51.5 to 53 | 51 |
About sizing when accessory armor is used: I’d recommend you add 1” to your chest and belly measurements if you plan on adding the chest pads and the KR-CELLi back pad, which will be most peoples upgrade choice. If you want to add the KR-2i back pad, add 2”. The Tech-Air airbag system can be used with this jacket and would be used in place of the back pad and chest protectors. If selecting the air bag system, add 2” to your chest and belly measurements before selecting your jacket size.