This rug pad is perfectly effective, but unusable due to a strong, pervasive odor. We bought it in the 8x10 size to go under a high quality hand tufted wool rug in our son's bedroom. I had purchased similar products from this site before and had no problems. The chemical odor was very strong as soon as it was unwrapped, but we assumed that it would dissipate with time. It has been 3 months and the smell is still as strong as the first day. We tried several solutions (air fresheners, open windows, baking soda...) but nothing helped. We have now discarded it and are going without a rug pad. It has been out of the room for only two days and the smell has almost entirely disappeared. What a relief!