I chose the mat that was recommended for the thickest carpet. Didn't work. In very little time my chair settles into the craters under the castors. I'm returning it.
Had the "light weight" version of this product and it wore out in a year.....and that's all the warranty was good for. This heavier duty model is MUCH better and has a lifetime warranty. Well worth the few bucks more. Great product!
flexible plastic easy to place and adjust 'gripper' teeth are not overly sharp (some cut right through your hands) time will tell if it has the structural integrity to hold up under the weight and heavy use it will get.