As the Smokies Rally approaches I was dreading my full face Bell for hours on end.. It pushes in on my cheeks near the lower front though the rest of the fit is good. I examined it a little and got the exacto knives out to perform a little surgery on the offending area. I then realized the piece was removable, that would make cutting it easier. Out it came and I noticed a label on the back, "40 MM". Hmmmmmmm? A quick search of the Bell website and I found they supply them in 5 MM increments, 20MM to 40MM. New 20MM inserts went in and now my Helmet is a happy place.