PLEASE NOTE BEFORE PURCHASING:Our Office Rolling Chair Mat is delivered folding in a bag. When it is used for the first time, there may be slight creases. Ironing with an iron will make the mat remove creases faster. Or just wait for 15-30 days with patience, it will recover flat completely.CUSTOMER SERVICE: We'd love to hear any feedback you have, if the chair mats have any problems, feel free to contact us, we'll find a solution together.customer satisfaction is our top priority.SPECIFICATIONS:1.Material: Surface polyester and Rubber back2.Thickness: about 0.35inch/9mmCLEANING & MAINTENANCE：If the surface of the desk chair mat for hardwood floor is dirty, you can use the vacuum cleaner directly to clean. When not in use, it can be easily folded and stored.