My 2009 aria profile helmet fits just as it should according to the online videos. However, the cheek pads pushed in too much so I started to order the next size smaller even though they were $45.00 from Arai.
When I got to the part about shipping cast, they wanted to charge $50.00 to ship them.
After a glass of pino noir, I had enough courage to take the chin pads out and trim them down.
Now they fit well and I saved enough for a case of pino noir.
Moral of story----they are easy to trim.
Keep in mind that many brands of helmet with removable cheek (and other) pads have pads that are pre-sliced part-way through to adjust their thickness. In my Arai, if one removes the fabric covering the cheekpad, there is a 5mm-thick pre-slice that can be separated. I'm assuming that - since the manufacturer pre-cut the slice - that the result is [I]still[/I] fully protective as designed. Don't forget that is important!