Review on Clear Hardwood Floor Chair Mat For Office: 47" X 47" Square PVC Transparent Under Desk Protector For Rolling Chairs by Marc Oner

This is recommended for hardwood floors. I have it on a very flat, commercial grade carpet and it still slips. I''m constantly readjusting it as it moves itself around. The lip to go under the knee hole is just a tiny bit too narrow to stay in place. I would think the opening under most desks is a standard width, so making the lip the proper size to slip under the sides of the desk and stay in place would so much better. As it is, It comes out and the whole mat proceeds to buckle on the other side. Not nearly as sturdy a mat as others I''ve had either. There are better options out there.