Guess it depends on the shape of your head. I have a big noggin but the XL D3 fit great. Previously had a Remedy in L and it was a bit big but have tried on 661 XLs and they were too small. I currently have a XL Rampage Pro Carbon, it isn't broken in but fells slightly smaller than the D3. Try one out and see how she fits, it is a great helmet.
I found I had to size up with my D3, previously I was running a large 661 helmet and got an XL D3. Not sure about how things fit after the padding settles in as I have only had the helmet a few months. That being said the helmet is awesome and is crazy light.
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