You need to really consider your environment when deciding what thickness to order. I misjudged and picked the medium thickness thinking my carpet wasn't as padres as it apparently is. As a result the mat bends under the combine weight of me & my chair & I weigh about 200 pounds so it may cause the mat to fail early. So carefully consider your situation.
This is a very disappointing mat it does not support an high back office chair on plush carpet. It does not allow roll-around capability and is too thin in construction to be charged so much for it.
Im really disappointed with this mat. It rolls on the carpet with the movements with my chair. I was hoping that the back will hold the mat on place instead I have to move it daily at the end of my day o I will have a bump when it reach my desk legs