My sheepskin (i'm going to use sheepskin shoes as its name) shoes are rated, personally, as very comfortable and great for indoor use. By the way, i know i said men shoes but they can be worn by anyone. I use my sheepskin shoes all the time because they are really comfortable, they protect me feet and they make my feet feel very warm during winter season. Never wear them outside because the hell and the base of the slippers can be damaged by sharp small rocks and pointy sticks.
Inside the shoe is mainly sheepskin and soft leather for the roof of the feet. The outside just contains leather and a sturdy spongy leather material that i don't know anything about. Its built for cold times and for feet warming but mostly to sell sheepskin products and xomfortable slippers that most people would enjoy wearing inside the house.
I recommend this product for people who like slippers, who like warm and comfortable things and for people who are plainly looking for slippers to wear.