This is my 3rd of the same chair mat. But this time Staples had none in store so we [the sales guy and I] ordered it right there at the store. What arrived was a mat w/NO teeth.....well baby teeth....it slides all over the place on my carpet. I have to pull it back into place at least 4x a week. Too bad cause this HAD been my favorite mat and my fav place to buy the mat! Unless the sales guy ordered the wrong mat for me [the whole plus side of the older version WAS it's big teeth and strong/thick base] this present mat has NO grip and isn't made has hardy as all the others!