I bought these for a dear friend who is wheel chair bound, she cannot wear socks or other shoes as they slip. I've promised her no slippage and true to word her fears of slipping are gone, she loves how they just mold to her feel and keep her warm.
I get a new pair of these every 3 years or so. The old ones don't wear out that fast, except for the fleece on the bottom. I keep them for outside wear!
The new ones this year are better than ever. extra puffy, warm fleece inside and a very nice sole. Try them.