Could be made of thicker material. The desk chair leaves dents in the mat that can be difficult to roll out of. This is the second one of these I've purchased and expect it to last a couple of years before it cracks and becomes unusable. It took me about an hour to clean the mat with some adhesive remover because the packing tape that's used for shipping was difficult to remove.
it is nicely designed but just too thin. wheels from chair sink into the mat and it is not easy rolling around on it. should be thicker at the price and much more stable.
I like the size and shape of the mat but the material is so soft that the chair sinks in making it almost impossible to move (roll) the chair while seated in the chair.