They won’t stay on! I have it inside another slipper since it was so thin and I have hardwood floors. All it took was placing it in my pocket for a bit and it came out looking like it was years old. 1 surround works amazingly well. Las volvería a comprar pues la uso casi diario. Take down bike, ride. I bought a large bottle, along with the tech-wash product for pre-washing. They are very cute, super soft and comfy. The box was damaged but unopened and they work great. It is really poor quality.