I bought these for my 12 year old who always has cold feet. They are very cute, soft, thick and soft. Immediately I noticed them slipping down their leg, slipping off the sole of their foot, or wearing the heel up. She hadn't fallen yet, but another family member was wearing a pair and slipped down the stairs a few hours later. I keep them to myself because they do what they're supposed to do - keep my feet warm. But I could leave them at bedtime.