I thought it might just be a problem with the first of the six pairs. Didnt work returned There when I need it and folds up when I dont. My 5 year old goes through sneakers like crazy. So far worth the money to me. Thought was too small but it stretches so i can wear it under my workout clothes everyday. Still not recognised. Well this is so small must be for dwarfsThis is okay for a facecloths! Someone with a narrow foot might slide around in these if they arent wearing socks, but for my very wide feet they fit well. Ordered several different types/sizes thanks to prime wardrobe, and not being able to try on in stores thanks to Covid precautions.