I bought two of these for the two new rugs I got from Great Offer Stock.com. I love these pads. You can place the non-slip side next to hardwood and felt up next to the rug on hardwood floors. You can just flip the pad over to layer your rug on carpet.
I would buy this same pad again for another rug.
Something I could not find in adequate answer to was the trimming. The pad is exactly the size stated. If I had not trimmed about 2 inches back around all sides, it would have looked weird from the side. I do not want to see the pad. It would have looked like a sandwich from the side. It also makes it less of a tripping hazard for us.
Your situation may be different. Think before you cut. It is better to cut twice than cut too much the first time. My husband took the long-wide scraps to put under heavy machinery and other places he may need some padding.
If you want wider scraps, cut the whole 4 inches off just one side. That's what we did. It cut easily with good scissors and a yardstick for making guidelines.
Great rug pads! I had bought those cheap waffle-looking plastic rug pads before for scatter rugs. Never again. I will always buy this pad!
My pads were fresh and clean. No odor at all.