Since Staples cut back on the products in inventory I was stuck with this mat. At the bigger end size wise the mats are flat and slide all over the pace. I'd rather have one with the nubbins on the back side so it stays put.
I buy a new one about every 2 years for my home office area (its my primary area in the apt). I do a lot of up/down and rolling around - more so than when I was at work. The govt buys JUNK.