There is no edge and it cut crooked; with that the chair rollers pick up the edge of the mat and will not go on it. Waiting to return it but I don't have the receipt.
Material is soft so I am hoping that means it won't crack like the last protector I had but the softness makes it difficult to roll your chair on when seated as your weight creates dents in the surface.
Once down and in position it works well at just lying there. Unrolling that prickly monster without inpaling your fingers is impossible. You must fetch the Blackberry pruning gloves and then have a go. GOOD LUCK