On my helmet that area had a poor fit as well
343414
The area on the inside of the helmet on the mouth guard is very cheap......cardboard. On my helmet that area had a poor fit as well.

A real shame because the helmet is cool. The TMS helmet is much better quality.
1637481
Not adjustable enough and fell to the back of my head when I wore it for cycling even when all straps were adjusted
4918651
After wearing the headphones for about a minute, I started having a bad headache simply from the fit.  They are very tight and after adjusting and playing with them, I could not find a comfortable position to wear them.  I am returning them.
3636234
The fit on this is big. I wear a xl helmet and hat and this was a bit loose on my head.
3214659
even thought i got this helmet at a size that fits me it on touches the top of my head and the sides just sit there loosely. i look around amazon for other protec helmets and i find that most of the other protec helmets being sold on amazon will just have the soft pads that will feel comfortable and still fit tightly around your head so i might send this one back and buy one of the other protec helmets that aare way better.
1003925
My last helmet was a Giro, which I know is owned by Bell, but it was a much nicer product.  Alas my Giro was damaged in a collision with a car but it saved my head.  I selected a medium size helmet using Bell's fitting chart.  I have a very normal head shape and size.  This helmet makes contact with a small area on the very top of my head.  Right at that point it had a casting sprew in the foam that was painfully uncomfortable and needed to trimmed off with a blade -- a sign of careless manufacturing / finishing.  I can tighten the helmet from front to back well enough but it then tips from side to side pivoting on the top of my head.  It comes down almost to the tops of my ears and just above my eyebrows which feels too far.  If I didn't know better I would think I took a small helmet.  It comes down so far that interferes with my glasses where they go over my ears.  No matter how I adjust the chin strap it rests too close to my neck at the very back of my jaw.  My Giro came with adhesive foam pads for the owner to place for comfort and to help the fit.  This Bell helmet came with no pads and the foam strips that are in it are so thin as to be practically useless.
  I used to ride motorcycles and felt good about getting a Bell helmet thinking that no company had more experience.  I thought that I could get away with a sight-unseen online purchase of a helmet where fit is critical because it was a Bell but I was mistaken.  I usually have an easy time with fit for most items because of my very average size and shape but not this helmet.  I'm surprised that so many people like it.  I was also disappointing to find that it's made in China.  It makes me think that the only thing left of the Bell company that I was familiar with is the name.
4609893
I ordered this for my birthday because I wanted to collect Proto Man as I already had a Megaman plush toy that my best friend and his brother had got me as a late Christmas gift. However upon receiving this product,the shades on the helmet weren't done very well nor did they fit correctly. A minor adjustment made it look somewhat better but not by much. The black part of the helmets visor doesn't fit the helmet at all.
3931208
The helmet is tighter than others I have bought at same size. The material along the cheeks and forehead is rather abrasive. ya get what ya pays for.
4402989
Returning....this is not the quality Bell helmet I've used before.
3285429
It was the head that was too small.  I took it off the one it came on and replaced it with a better fitting headband!
1357011
I have a wide head. That visor was very painful. The area where I need the width was just as narrow as any cheap visor on the market. I gave it it my friend who has a very small head. She said it was perfect for her.
4656699
Materials appear adequate in quality, but it didn't fit my head well and will take a fair amount of workshop time to shape the foam and reattach the rubber pads. Partly my fault for buying something that needs individual fitting online.
4458497
I have a normal head and this did not even fit me a little bit.  I ended up tearing off the netting and just pinning that over my eyes.
3599351
Before I ordered this helmet, I went to a Harley dealer and a Yamaha dealer to try helmets on to make sure I ordered the correct size.  I wear an XL to XXL depending on the brand.  I ordered the XXL size on the PGR B31 to be safe.  When it arrived, I tried it on and it didn't even cover the crown of my head.  The XXL is closer to a Medium or Large in other brands.  Additionally, the chin strap is very cheap with a flimsy and thin metal adjuster.  To make matters worse, I now have to pay the return shipping on this item.
3073048
My head is 58cm and this helmet is too big, specifically too wide. Also, the plastic tightener in the back is cheap and sticks, making it impossible to tighten/loosen without taking the helmet off and messing with it. I returned the helmet and purchased a different $20 helmet which fits much better and has better quality straps and tightener.
1182889
This is a well reviewed helmet at a good price (~$35 at purchase). However the sizing and fit did not work for me. The medium/large was simply too large and looked goofy.  Though the size is highly adjustable (I could tighten the adjustable band snug around my head) there was too much play to the harder interior surface. If you have a medium sized head avoid the med/large sizing.
3247583
I gave it three stars, but that is not a fair rating.  I could not use it because there was not enough room between my sunglasses and my bicycling helmet.  Maybe I just have a squished head!  In any event, I returned it.