Product: Triangle Backrest Wedge Cushion — waterproof technical cloth cover, elastic pearl cotton filling. Key benefits Comfortable, stable back and head support for sitting up in bed or on a sofa. Reduces muscle tension in the calf, waist, back, shoulders, and neck by keeping the spine aligned and providing even support. Replaces a bulky headboard or fills the gap between mattress and wall for better posture and more comfortable rest. What makes it effective elastic pearl cotton filling delivers strong resilience and immediate springback under pressure, balancing firm support with soft comfort. Large triangular shape and firm fill keep the backrest plump and evenly supported over time. Extralarge wedge design fills the gap between wall and mattress and can serve as a headboard substitute. Materials and construction Cover: waterproof technical cloth — delicate to the touch and wearresistant for everyday use. Filling: quality pearl cotton for lasting resilience and even support. Removable cover with hidden zipper at the bottom; detachable buttons for easy removal and cleaning. Builtin side pocket at the bottom of the backrest for phone, earphones, or remote control storage. Compatibility and use Designed for use on sofa beds, bunk beds, queen and king beds; also suited for family beds and living room sofas. Functions as a headboard pillow, lumbar support, or general backrest for sitting and reclining. Portable and versatile for use in bedrooms, dorm rooms, living rooms, or by a window. Practical use scenarios Reading in bed: Sit upright with head and shoulders supported to reduce neck strain during long reading sessions. Living room relaxation: Use on a sofa for back and lumbar support while watching TV or playing video games. Dorm or small bedroom: a traditional headboard and add storage via the side pocket for compact, supportive comfort. Care and maintenance Cover can be removed via the hidden zipper and secured with detachable buttons for easy washing. Waterproof technical cloth resists spills and everyday wear; spotclean or follow washing instructions on the cover label. Who it's for Anyone who wants better posture and more comfortable sitting in bed or on the sofa: adults, students in dorms, elderly parents, manual laborers, or indoor fitness/yoga enthusiasts who need extra rest support. What you get A triangle backrest wedge cushion with a waterproof technical cloth cover, elastic pearl cotton filling, hidden zipper and detachable buttons for a removable cover, and a convenient side pocket for small items.