I obtained my first pair of these boots over ten years ago, when I spent some time training in BFC Valcartier, CA. The Mukluks kept my feet warm about as well as VB boots (military "Mickey Mouse" boots) but with less than half the weight. Since then I've used them around my Vermont home. They work well with my Tubbs Snow Shoes. The canvas upper is a drawback in that it is less resistant to chemicals than VB Boots but they are taller (covering most of the the calf) and less rigid around the ankle (providing better freedom of movement). The canvas on one of my original boots became damaged by either salt water or (more likely) battery acid. I've been looking for replacements since and was happy to find a pair this inexpensive. Felt liners do not come with the boots and are required.
I was issued my first pair in 1975. The thin wood booties didn't work very good. Had my father get a pair of sorel snow mobile boot liners from Farm and Fleet and ship them to me in Germany. Worked great. This is my 4th pair since retiring. I wear them taking care of horse during the winter and even riding on really cold sunny days. The cotton uppers may not last as long as nylon but the price makes it affordabe to replace every 4 to 5 years.
I use these daily in central Alaska. Bought my first pair in 1972. For extreme cold you must use felt booties and 2 inch felt pads. Removal of the pads is immediately noticeable. I use them when the temp is 50 or less. Warmer calls for rubber or leather.
I have to say that I'm very please with this pair of boots. I use these boots for my daily walks to see just how warm they really are. The coldest temperature were in the low single digits here in the North East, being southern Mass. I purchased the medium size boot and a size 11 boot liner for my 10.5 shoe size and are a great fit with two pair of wool socks. The only modification that I did to the boots was to water proof the upper canvas with a home made silicon mixture that I make up for porous materials and tent seams and changed the boot lace to wax impregnated 550 cord so that I could wrap the cord around the ankle, which helps to keep the heal of the boot from slipping. The boots are light in weight and allow good flexibility in the ankle, foot and toes.