Webbikeworld made a comment about this when reviewing one of their other helmets. They use the smaller shell size for the size large. I tried on a couple models at the IMS show and it was VERY tight getting it on and it did fold my ears over. Once it was on, it was snug and comfortable. I tried the XL which has the larger shell size and while much easier to get on, it was too loose on my head. Oh and interesting about the shield. Thanks.