I use a 10 in Chota footwear and a 10 OTB was just right.

M_M gave me some sizing info last fall.

S_T Removable insoles would give you a lot of sizing adjustment for a wide foot. One is thin and kind of a stiffener, acts like a steel shank??? But it's not metal, it has some flex. It would keep you from feeling sharp rocks underfoot.
The other is like a regular insole, the one I'd remove to use them with my neoprene wet socks.

Mine did NOT have the little pocket in the tongue to tuck the laces in. I don't know if it still looks that way on the website??