I cant even tell you how many times I had to stop to adjust the straps because the velcro kept coming loose and popped off the heel because I LOST COUNT. They are not responding and now I have spent more money on something that failed and I dont have a replacement! 5 to a 6 depending on the shoe sometimes a 6. This is way too big to be fitted on a 16 inch wheel bike, I have 2 bikes and this will not fit either as it is way way too tall. I barely could get it under the screw lugs, and tinned ends are sooo fragile. First pair of shoes I have found that work for my needs. I needed it for just one day- for a sample sale. I was able to make it work with the rubber straps that are included but barely, and not sure how sturdy those straps are, so time will tell. Sturdy, functional and space saving. This bunion sleeve is great!