I have a small online shop that sells medical supplies and edema shoes are one of the top sellers.
I used to sell about six different kinds, some made of plastic, some from leather and others made from cotton and polyester pads. The cotton and plastic ones were sold the most though, mainly because they are much cheaper than the leather ones and equally comfortable. So I've stopped selling the leather edema shoes for now.
Edema swelling is the top reason for why people purchase them. Most of my customers are either pregnant or are experiencing swelling because of a health condition or treatment. It's a good product for people with diabetes, arthritis and who are taking chemotherapy treatment because these conditions cause swelling a lot.
I also have customers that purchase them for uncomfortable skin conditions, like a bone deformation or painful calluses and corns. It really is a very popular product.