Having initially been shocked at the cost - I thought it was expensive as we needed a very large size as we had a very large rug - I am very pleased with the product. The rug is laid over carpet and slipped a lot by the end of the day -a real pain to move back to the original position. Not any more as the underlay has been very effective! Can be difficult to position underlay and rug exactly so we started with the rug wrong side up and attached underlay at various points and was worth the effort. Would recommend.