The size is good but the mat is both thin and slippery. Chairs make indentations so it is hard to shift a chair out of the indentations to ease it forward.
It is a nice heavy mat but dents easily and leaves ruts for my chair to roll into. I have to keep moving to a new spot on the mat. The carpet is in fact 3/8 Berber. I am 220 lbs. Probably sending it back.
I love the matt but was very disappointed how it was when delivered. It wasn't rolled up it was bent so I had to put a tote on it for 3 days to flatten it.