A very secure way to hold rugs in place and add just a little more 'give' to the rug surface.  The side of the pad that goes down on the 'slick' or hard floor surface has a rubbery texture that keeps movement against that surface to a minimum.  The 'up' or rug side has a rough, prickly feel that will keep the fibrous rug bottom firmly in place.  To add to the comfort, the rug is about 1/4" thick and has a 'springy' feel that will add a little bit of softness to the rug.  You can trim these pads with household scissors, but they should be in good shape (sharp).  We have a scissors sharpening machine that we needed to use halfway through the rugs installation.  Old or arthritic fingers may find cutting this pad to be a little bit of a chore.  We like these pads and would buy them again.