1. Material: The inner filling is crafted from cotton linen and density sponge, offering stability and comfort to bridge the gap. Designed for a comfortable sleep without feeling the space between the beds. 2. Practical: Eliminate insomnia and close the gap between the headboard, wall, mattress, or footboard with this mattress gap pillow. The foam cushion fills the gap, preventing the loss of pillows, pets, or children's toys. 3. Wide Application: This durable bed gap filler delivers exceptional 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 washing. The smooth zipper ensures practicality and convenience. The sofa armrest cushion cover is suitable for both hand and machine washing.