Helmet manufacturers are pretty consistent about sizing WITHIN THE SAME BRAND. So even if they don't have the exact style you want, as long as you can size your noggin to another helmet of the same brand ordering is a piece of cake!
Yes there are aome 3XL helmets in store but majority need to be ordered. They can even get larger like 4XL and 5XL
If they do not have them in stock, they can order them. I know they do have some though
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