The Ohnana Rayve is 2.1 x 1.8m or 7' x 5'11'', large enough to fit most air mattresses. For reference: most queen sized double air mattresses are 2 x 1.5m or 6'6' 'x 5'. If you plan on sleeping on an even larger twin airmattress, don't forget to check out it's size to make sure it fits.