before we had a mattress for the smallest with 2 strands on each side, we had to change for the big and we bought it. The size and simplicity of inflation and folding her an advantage, as the double lock the large side is delighted to be able to close himself his "cloth". by against the mattress makes a lot of noise when it moves and it shifts a bit to the side with the cloth pinned under him he capsizes ... weird, but good overall we are satisfied.
