Lightweight, warm, and if you're patient you can get them for a great price. I wear them mainly around the house and easily get a year to 18 months of heavy use out of them. After that I normally can continue to wear them as the outer side of the shoe still has held up, but the fur on the inside gets so flat, it becomes a bit of a loose fitting. So around that time I start watching the prices of the colors I like and snag a pair when they go on sale. Very warm and helps get my feet feeling dry. If your feet run cold because your feet get damp, I run these along with smart wool socks. Then I rotate out the socks as needed. Great gift as well. I get these for my family but I don't they'd survive many tug-of-war fights with a dog.