Hey you guys, just a bit of advice!
I ordered my Leons a size and a half too small, and because of the final sale policy that Massdrop has I couldn't exchange them.
What I did do is contact the retailer directly at https://www.vladofootwear.com/.
I explained what happened, and they offered to do an exchange no questions asked!
They're stationed in Los Angeles, so I drove over and grabbed a bigger size and didn't pay a cent.
Unfortunately, if you live anywhere else, they'll have you cover shipping for the exchange, but I'm under the impression that they'll still do it.
Good luck, it's worth a try.