I forgive three stars for this mat, because I (according to some tips here) simply open valve did leave and she has then over a prolonged period (2 hours) will actually fully inflated. I lay down on it and not feel anything from the underground (despite my weight), so far the mat would in this respect fulfills its purpose. The 2 m length cut not quite there, but it would have been enough for 1.94 m. Insofar also okay. How however can sleep on is, I do not personally a mystery. First, the mat has a maximum width of my shoulders. Lying on his back hung my arms so the side of the mat diagonally down to the ground, which (but by no means is, of course, particularly due to the height of the mat at 10 cm, is not without reason when ordering the amount at once with 5-10 cm instead previously stated 10 cm) is. Back sleeping thus impossible. And how I should do it as a side sleeper me to turn on the mat at night to and fro me is also a mystery. As you slide off the mat or is constantly monitored. I had ordered the mat without measure me before because some of them were talking here, that it is wider than others. This review should therefore people who are built like me to help. Two stars deduction because not agree all dimensions (width, length, height) so. Of course I can not say anything about the life of the mattress by my returning unfortunately.