Great product,.  Looks super cute.

 It is not really warm enough for a Michigan winter. I thought I could use this along with her existing boots instead of purchasing snow boots. It wasn't warm enough, so I still had to purchase snow boots.
It will probably work great in a warmer climate.

I suggest buying the boots a size larger if you plan to use the sleeve.
Also, if you are putting this on a toddler, try putting the sleeve on the foot first and then putting it into the boot. My daugter kept kicking it off, when I inserted her foot into the sleeve and boot all together. I think it was uncomfortable. Sy is pretty happy with it now. :)