1. Material: The inner filling is crafted from cotton linen and density sponge, offering stability and exceptional comfort to bridge the gap. Designed for a comfortable sleep, ensuring you won't feel the space between the beds. 2. Practical: Eliminate insomnia and seal the gap between the headboard, wall, mattress, or footboard with this mattress gap cushion. The foam filling prevents the loss of pillows, pets, and children's toys. 3. Wide Application: This durable bed gap filler delivers comfort, support, and convenience. It serves not only as a double bed bridge or armrest/headrest for wooden sofas but also bridges gaps between headboards, walls, and mattresses. 4. Removable Zipper: The cushion cover features a detachable zipper design for easy removal and reattachment, simplifying cleaning and replacement. The zipper is user friendly and practical. The sofa armrest cushion cover is suitable for both hand and machine washing.