It's a very simple gadget really and I laugh at myself for not even realising that they existed until recently. I live in a relatively wet area and because of that I had a shoe rack containing 9 pairs that I wore by rotation. Since the Caremax dryer arrived I have only needed to use two pairs of shoes and I have been able to put the other 7 pairs away until I need them in the future. Because I walk through long wet grass the shoes are usually thoroughly soaked and they take about an hour to dry properly. I don't know how the ozone works but once the shoes are dry there is no longer any foot odour in them. It is definitely one of the most practical purchases I have made this year.