I had a sleep study and my ins paid for c-pap machine and mask. I was told I could trade in mask until I found one I liked- this was in October. I have traded in the mask more than twice. They told me once I found one that I liked I could exchange it. I finally found one in March. When I told them I found one that fit me the best, they told me I could not trade it in, and that I had only 30 days from the Original date to exchange it-mind you I had already exchanged it more than twice sine October and more than 30 days after the original purchase date. They lied. Think twice before you decide what company to use. read more