Won’t fit into a shoe or boot
I gave this four stars because it works well for my sprained ankle and is comfortable to wear.  Unfortunately it won’t fit inside footwear, including some roomy cowboy boots, so I can only wear it around the house.  A few minor disadvantages: a mesh piece that is supposed to go over your heel kept coming out, so I sewed it with needle and thread to keep it in place.  I have to open the laces all the way to get it on and off my foot.
Rating: 4 stars