I keep these up in Michigan because nothing seems to keep the house warm. I've tried heavy wool socks, fleece lined slippers, and numerous other footsie sort of things. These are the most practical and the best. Though they make me look like Bigfoot and sort of remind me of an elephant's feet, they are fine for prancing around the house in. They are waterproof, well cushioned, and by way of the cushioning, well insulated and toasty warm. They have an adjustable toggle that keeps the warmth in and they are comfortable to wear. I shuffle around the place in these all the time and sort of hate to come back to the realities of winter when I take these off to leave the house.
I wear a size 9 womens. I bought size large which supposedly will accommodate up to a size 10 womens. No way are they realistically sized.  They just made it on my feet.  Pity the ladies who wear a 10 and expect an accurate fit. I recommend to size up if you are at the top range in the recommended size.