[Comfort] Uses pocket coils in which each coil spring is independent. You won't be bothered by vibrations, and it's as comfortable as sleeping on it. [You can choose the height of the legs] The 12cm can be used as a low bed that does not create a feeling of pressure in the room. 20cm and 26cm can be used under the bed to create storage space. *Please be sure to attach the legs when using. [Differences from the old product] In order to solve the previous issue of the product being too large to be purchased because it could not be transported to the location where it would be installed, the coil unit was packaged in a compressed roll and the steel frame was divided into two in the center. I made it possible. *When opening the compressed roll, cut only the outer packaging (paper wrapping) so as not to cut the contents. *Mattresses that have been opened cannot be recompressed. NOTE: Legs are sold separately. No legs included when you order/purchase this item.