I've been wearing the Brentwood for about 4 seasons now. I have an average size head. The medium was a little tight. I busted it and then got a large which is a little loose but I take out all the inside padding/flaps and wear a hat underneath. With my hats I get the perfect fit. Love these helmets for the light weight, low profile look, and great fit for my goggles.
Try this trick and spin it, yeah
Your head will collapse