This is a cushion used under the mattress, which helps to alleviate the sagging of the mattress caused by the excessive gap between the support bars of the bed frame. It is suitable for general beds, sofa beds and metal bed frames. It is made of natural bamboo and nylon straps. Due to the toughness and strength of bamboo, it provides additional support to the mattress. The bamboo strips are arranged in a certain pattern, leaving some gaps, which improves the breathability of the mattress! It can be folded and rolled for convenient storage!