We bought two of these for our livingdining rooms.  They are pretty soft underfoot and very low profile.  A couple of the corners did curl a bit when we first got them but we just placed a heavy book on them and that sorted the issue out.  We don’t have anything underneath them so not sure if that would help with the slight crinkling on the big one, but it’s not a big deal to us as this is not a high use area.  Still pretty pleased with the purchase and love the way they look.