1. Gap Filling: The wedge pillow seamlessly fills the gap between the mattress and headboard, ensuring a flat and comfortable lying surface. The cover of the mattress extender is made of quality, breathable, and soft linen fabric, capable of filling gaps ranging from 0 to 20 cm. 2. Elastic Foam: Provides durability and support without yielding. Even after prolonged use, the wedge cushion maintains its shape and does not lose support due to compression. 3. Removable and Washable Design: Our mattress extension features a zipper for easy pillow filling. It is simple to clean, keeping your sleeping area neat and tidy, and extends the lifespan of the mattress filler. The cover is machine washable. 4. Easy Installation: Installation takes just seconds—simply place it under the fitted sheet. Our filler liners come in various lengths, widths, heights, and colors, allowing you to find the addition for your bed.