1. ※Memory foam cotton linen: The cover is crafted from soft cotton linen fabric, offering comfort, breathability, and antipilling properties, suitable for both hand and machine washing. The core is filled with ecofriendly sponge, providing a balanced softness and firmness, elasticity for lasting comfort when leaned against. 2. ※Gap filler: Designed to fit snugly against mattress seams, preventing the loss of pillows, pet toys, or children's items. It delivers effective support for the head and neck, alleviating body pressure for a better sleep experience. 3. ※Removable Zipper: Features a zippered design for easy removal, allowing convenient replacement and cleaning. The zipper ensures a tight seal, enhancing the gapfilling performance. 4. ※Versatile use: Functions as a wedge headboard pillow, bed gap filler, mattress extender, or bridge for gaps between headboards or walls. It also serves as a sofa back support or foot cushion, delivering a comfortable resting surface.