I wear a Medium in Smith Hustle so i would think that the M/L in the TLD lid would fit, as it did, but just a little snug. I guess with this helmet you want it pretty tight. As Drew mentioned, I found out that fogging was the main dislike of this helmet. Once I got going again, it did start to clear up a little, but since it was pretty cold, the fog froze and I had to deal.
All in all, the lid works great and offers awesome protection. I wore the Oakley Crowbars with this helmet, and it was a great fit. No gaps whatsoever. If I didn't have to wait in tram/lift lines and fog up, this would be my everyday helmet.