Sidis DO come in Mega sizes less than 40 because I have 38s in a Mega. Maybe this has changed since I bought my shoes 3 years ago, but usually i wear 36 or 37s. The Sidi mountain shoes I originally had were causing my feet to swell and go numb, so I bought the Road version of the Dominators in a 38 mega when i got new pedals. They are perfect and I can wear Woolie Bully socks with them with no problems.