1. Gap filling and comfort The wedge pillow fills the gap between mattress and headboard to create a flat, comfortable lying surface. The cover is high quality breathable soft linen fabric and can fill gaps from 0 to 20 cm. 2. Durable support Highly elastic foam provides excellent durability and support without yielding. Even after prolonged use the wedge cushion does not deform and does not lose support due to compression. 3. Removable and washable design The duvet-like design includes a zipper for easy filling. It is easy to clean to keep your sleeping area clean and tidy, and it extends the life of the mattress intermediate layer filler. The cover is machine washable. 4. Easy installation and customization Installation takes seconds and simply lays under the fitted sheet. Our liner fillers are available in various lengths, widths, heights and colours, so you can find the perfect addition to your bed. Use scenarios - Reading or watching TV in bed with a flat, supported surface. - Beds with a headboard gap where you want stable sleep positioning and reduced edge roll-off. - Quick bed improvement for guests or dorm rooms while preserving mattress life.