Slippery bottom and not recommended unless you have carpeting everywhere. If you have stairs without carpeting you are risking a slip and fall every time you wear these. The smell even before I opened the bag said to me 80's low quality materials and I was right. The sole was that foam that you saw in a lot of shoes and slippers back then, that is used in flip flops, but it has no tread on the bottom allowing for any grip but lots of slip. Maybe that's why they called these slippers? In short, I likely will not wear these since I have mainly hardwood floors and don't need to break anything. To those that buy them still I hope you have good health insurance because it's only a matter of time before it's needed due to these and I'm not kidding.