Love the company and previous iterations. The zip idea is a good one but to be honest they are quite tricky to put on. Best to put on round the ankle and slide up. Am not convinced the zip is up to the task: too small and fiddly. Be careful as I believe they come up a bit on the small size. My mediums are too tight; can't wear for more than half an hour. The type without zips might be a simpler product