We put these on concrete steps that lead to our back door. These steps get a lot of use, in all kinds of weather, in all kinds of shoes and boots. The treads do not slip around (even on wet concrete) nor are they slippery when wet. They are well made (no uneven cuts or manufacturing tabs) and of a good thickness--thick enough to provide good traction but not so thick as to throw off your natural stride. I was amazed at how much this little addition to those concrete steps improved their appearance too.