Good product. Fits over the NHS medical boot I'm wearing whilst my ruptured achilles is healing. I needed the covers because I have to wear the boot in bed (very inconvenient!) and so need to keep it clean when I go outdoors. When using these covers you will find it helps to use a length of velcro to tie around the lower leg - stops the cover flopping around and being a trip hazard. You will find the cover soles wear through quite quickly - I purchased some self adhesive ribbed rubber sheet on eBay and have cut out the shape and stuck it to the bottom of the cover to strengthen it. This way, it'll last forever and I'll have 19 spares!