We purchased the rubber underlayment for under carpet tiles in my home office. The purpose was mostly to add a little height so it would be closer to the adjacent hall wood floor. The very slight added cushioning and insulation is a bonus. I was initially concerned about the strong rubber tire smell but I washed it down with soap and water and aired it outside for two days before my husband easily installed it. With the dense industrial carpet tile that cover it, there is not a hint of odor now.