We tried the size Medium in this jacket on Huey and we put an XL jacket on Dewey. These are the sizes they normally wear and both fit great. My advice would be to wear the size you normally wear in men’s clothing.
If you look at Icon’s chest size estimates for each jacket, you might be choosing a size larger than you normally wear (example a person with a 46 chest typically is an XL, but using Icon’s chart you’d buy an XXL). Icon’s styling has always been sort of loose as compared to other brands’ sport style jackets. This probably explains why the size chart understates the chest size range for any given alpha jacket size.
My personal advice for a good fit that is snug enough not to flap or inflate while riding would be to buy the size you normally wear in men’s clothing. We’ve added a column to the table below to give you our estimate of max chest and belly size for each jacket size. If you prefer a loose fit, then Icon’s estimates would be appropriate.
Contrary to Icon’s marketing info which says this jacket has an “Icon Sport Fit”, I find the taper from chest to waist to be pretty “relaxed” and therefore belly size won’t be a problem for most. But if you have a bit of a belly, you’ll want to get a measurement and make sure to choose a jacket large enough to work. The jacket has the side waist adjusters so you can snug the waist/belly down to get a good fit.
| Size | Icon’s Chest Est | Our Max Chest | Our Max Belly |
|---|---|---|---|
| Small | 36-38 | 38-40 | 36 |
| Medium | 38-40 | 40-42 | 38 |
| Large | 40-42 | 42-44 | 40 |
| XL | 42-44 | 44-46 | 42 |
| XXL | 46-48 | 46-48 | 44 |
| XXXL | 48-50 | 48-50 | 46 |
| XXXXL | 52-54 | 52-54 | 50 |