This air mattress states it is heavy duty, but after 2 days one corner seam began leaking. I used the supplied patch that does not form to corners and would not seal. By the way I have no idea how this matters is considered heavy duty as the bottom seam is minimal at best, and has folds or ripples as the seam follows the corner so there is absolutely no way their supplied patch could seal the tiny leak you can only feel - not see. I tried using a vinyl pool patch with its supplied glue, but it would not follow the corner either. I then tried using duct tape to hold the patch to the corner shape and let it sit overnight - I had an empty flat mattress. Dont buy it is my recommendation. As an aside - heavy duty must not mean what it once did.