I'm returning this item. I loved the size and rectangular shape of the mat but it it wasn't firm enough. After a couple hours the wheels on my chair started making indents in the mat. I weigh about 150 pounds. My chair settled into the indents rather than sliding smoothy across the mat.
The chair mat creates divots within a few minutes of sitting in the chair and makes it difficult to move around on teh chair rollers. I would not recommend this mat.
This mat arrived rolled into a tight roll and tape around it. The tape left a thick sticky residue that was incredibly hard to remove and the mat wouldn't lay flat because it was rolled so tightly in shipment. Spent 30 minutes working to remove the sticky tape residue.