This is used and a clean mattress. Sleep Number XL Twin S-276 Mattress Pad. The dimensions are 72"x30"×6"

When inflated.

IT HAS TWO  "O" RINGS FOR BETTER SEAL. And it holds air tight with no leaks. It was leak tested for many days with weight. And it has no stains.

Also, please make sure if your pump will fit well the 2 O ring nipples before purchasing.

Thank you!

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