Genuine US Air Force issue mukluks. These are what they used to issue as "Arctic Winter Wear". I had a pair just like these years ago, and they are toasty warm at sub-zero temperatures. You can also wear these with snowshoes.
These are brand new, never been worn. I did treat them with silicone waterproofing spray. I also replaced the laces with elastic Lock Laces, which are much easier to get in and out of. When zipped up, they reach just below the knee.
The size is Large, which will fit 12-14 or so (I wear a 12). Each mukluk has two felt insoles, so you can remove one if you are related to Bigfoot.