I just got a new sleeping pad last year, so instead of buying a new one, I decided to take matters into my own hands. After researching online and watching some videos, I cut
my pad down in size and resealed it with an iron. My 25 x 72 Nemo Tensor Insulated is now 25 x 60. The seal seems to be holding but I am going to leave weight on it for a couple days as a test to be sure. To be safe, I made the new seam about a half inch wide, which is a lot wider than the factory seams. It was scary to make that first cut, but in the end the process was very easy! I practiced a few times on the scrap that I cut off.
Cutting off the length I don't need has a few benefits. It is now 3.2 ounces lighter, which is not much, but I'll take it. More importantly, the pad will now take up less room in my tent and pack, and be faster and easier to inflate.