Yea, that's what I thought too. I was surprised when they said I need to order and pay for it in advance. I mean, I could always do that and return it if I wanted too :P. I did try a pair of size six mocs with regular dress socks and they fit very snugly. But if I want to wear wool socks too I don't think they'll fit. When I wear wool socks with my 1ks my 1ks are at their limit. Any more and it would be very uncomfortable. And the 1ks are wider than IRs.
But most importantly, due to the weaker Canadian dollar, gravity pope is selling IRs around $70 cheaper than the msrp on the red wing website.