Was looking for a mattress to fit a 1974 pop-up camper. Was worried that this might be a bit too long at 75", but took the gamble, hoping I could squeeze it into the 72" bunk frame or have it altered. When I first unrolled it, it was a few inches short of the 72" frame. After a couple days, it expanded to 'almost' fill the frame. If you need a 75" mattress, this may be a bit short, but was perfect for what we needed. And much more comfortable than the 3" thick 37-yr-old foam mattress that came with the camper!