PU Foam Underlay
Foam carpet underlay is easy to cut and fit, relatively light to move around, and much liked by carpet fitters. PU foam is a newer type of carpet underlay, made from granulated foam which is compressed and thermally bonded together. They are less dense than sponge rubber underlays, but are slightly more durable and are the best insulators for warmth. They weigh a lot less than a traditional sponge rubber underlay, and so are easier to handle if you are fitting them yourself.