As usual, Muk Luks aer comfy, cozy and warm. NOT intended for outdoor wear [if you're not familiar].
I have a long narrow foot and in regular street shoes/boots I normally wear a 9-9.5. The "extra large" in this particular slipper boot is for sizes 9-10.5. When I tried them on mhy first thought was, "thank goodness it's not a leather boot..." My toe was at the end, but no worries as they are knit and stretch and YES they're too wide for me, but that's normal, and there is no way to walk out of them =)
RECOMMENDATION: buy 'em if you like 'em
PROS: Good across the board
CONS: none

Happy Shopping!
Rose