I wear this indoors for 12 hours at a time.  It is a physically comfortable boot with high quality materials.  My only complaint is that it is a HOT boot that doesn't breathe very well.  The inside of the side zipper has a latex type material that acts as an internal cover, I guess is to keep water out.  For this reason, since I wear it indoors most of the time, I will not buy it again.  But, if you are looking for a boot to keep your feet warm, this one would be great.  The zipper is very smooth, and there is a nice little velcro tab to secure the pull.