(Material that does not loosen or damage your mattress): We have received feedback from our customers and have improved the 2019 version mattress belt.By suppressing the luster of the material, it is more slippery, and the width of 2.0 inches (5 cm) is thick enough to hold the mattress without damaging it.The buckle is also lightweight to prevent sagging. (Extra Long Size, Supports 2 Double Sized Mattresses) The maximum length of the mattress band can be extended up to 32.8 ft (10 m). It can accommodate two double size mattresses so it is OK for larger beds.