I had tried other sites, but found eFoam through Google. It was very easy to understand the measurements, use and qualities of the foam products, and also to compare prices of different permutations at eFoam. Also the thickness of the foam was easy to change to see cost savings. Being able to buy in sheet form to cut myself, has meant I can buy the right size to minimise wastage. My use? Reupholstering 6 seat pads for a set of antique dining chairs 4 standard plus 2 carvers. I bought a sheet of high-density foam, and a topper of medium density foam, with a total depth of 3 inches (7.5 cm) as the foam layers will rest on webbing within the seat frame. :)