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.
I purchased this mat for my home office. The others which I had purchased in the past were too hard and heavy and cracked very easily. I would purchase again from Staples. Thanks VN / Georgia.