SmartSox does work
yes, I have used it. I used SmartSox for my 19 year old mare with navicular, as I wanted to get one more barrel racing season out of her. It was actually suggested by my vet, because it increases blood flow and therefore alleviates heel pain. It worked well, I weaned her off of bute as I used it more. She stayed pretty sound until the end of the season. I took her off of it because I had pretty much gotten what I wanted out of the season, and it is a bit pricey.