I wear size 11 in almost everything and usually wide, so I would say I am semi wide, that said my lowas are 11 wide and fit perfect, I wear darn tough socks, I also hunt the northeast, I am comfortable in these boots while moving from 10 degrees to 75, inactive sitting the lowest I would probably go would be 35 maybe, I really never sit in these boots much I am always on the move still hunting, if it’s really cold I am in my IWOM sitting and then the boots don’t matter, so active there awesome, motionless I’m not sure but would guess 35, if you don’t put a lot of miles on and hunt flat country these mite be overkill, there serious boots.