ULAND UNDER MAT INDDOR HELPFUL CARPET UNDERLAY
These had a smell when originally out of the package but after sitting outside for 30 minutes, it was gone. These work perfectly and I'm very happy with the purchase. The price was great too.
Bought this for the corners of a rug on hardwood. Works great. I would recommend opening package outside and allowing contents to air out as there was a strong chemical order in the bag. After an hour outside, it was fine to install. Does not leave a mark on floor.