This may be helpful for you:
1, Shoe sole must be clean and smooth. Please wash your shoe sole carefully with water, then wait for the shoe sole to dry before you apply the pads on it. Otherwise it may reduce the stickiness of the pads to the shoes and to falling off.
2, Please follow the installation instructions. Mistaken installation may to a failure or falling off.
3, As a matter of experience, If floor is over wet or oil, it may reduce the effect of this shoe grips.
4, Vigorous exercises such as running at an intense level may also reduce the effect of this shoe grips.
5, The sole pads are thin enough to be noticed when you apply it to your shoes.
6, If your shoe have self-nonslip function, you don't need them.