This mat is not working for me like my last 2 have. The prickly side is less effective than my previous ones. It does say that it is for flat pile carpet. It walks on my carpet so I guess my carpet is too thick. I bought it because it was the only one available at Staples. I need a sturdier mat. It probably works fine if you have really flat carpet.
only had for a week and chair wheels are sinking in the mat. Not as good as the last one I had for around 4 years. Apparently not as strong as the 1st one. Too thin I guess.