This mat is clearly designed to go on carpeted floors, not hard wood, thanks to the burrs on the underside. My fault for not scrolling through the pictures to see this was the case, but this item shouldn't be advertised as a mat for hard floors when that's not what it is! In fact, this item is downright dangerous for hard floors, as the burrs lift it up and reduce contact with the hard flooring, making it extremely slippery.