Triangle Back Cushion Cover with Removable Fill — breathable fabric, upgraded 15D polyester fiber fill, ergonomic triangle wedge shape for adjustable support. Key benefits Comfortable, supportive rest: The wedge design supports the natural curve of your back and elevates the upper body to reduce strain on back and shoulders while sitting or reclining. Durable, resilient fill: Upgraded 15D polyester fiber delivers consistent density and rebound so the pillow keeps its shape and support over time. Easy care: Outer cover is made from breathable, softtothetouch fabric and closes with a zipper for quick removal. Simply unzip, remove the cover and unroll the buttons for simple cleaning and maintenance. Versatile use: Functions as a back support pillow, large headboard cushion, or decorative accent for multiple seating and sleeping surfaces. Product features Shape: Large triangular/wedge pillow for adjustable angles and stable support. Material: Breathable fabric cover; filled with upgraded 15D polyester fiber for density and resilience. Maintenance: Zippered, removable cover; simple button unrolling for easy cleaning. Compatibility: Designed for beds, sofa beds, iron beds, recliners, window seats and other seating surfaces. Suitable for bedrooms, sunrooms, and dorm rooms. Multiseason use: Works yearround as a headboard pillow, backrest, or kids' headrest. Practical use scenarios Working or studying: Sit upright in bed or on a sofa with the wedge behind your lower and middle back to improve posture while using a laptop. Relaxing and entertainment: Lean back with the pillow at an adjustable angle for watching TV, gaming, or reading in bed. Bedroom and living space setup: Use as a large headboard pillow on a bed, sofa bed, or window seat to add comfort and a clean, functional accent. Why choose this pillow Ergonomically designed to match the back's natural curvature and provide proper elevation for everyday activities. Breathable, soft fabric and a resilient 15D polyester fill combine comfort with longterm performance. Removable, washable cover keeps the pillow hygienic and easy to maintain. Large and adaptable enough for multiple furniture types and rooms, including use as a kids' headrest. Care and maintenance Unzip and remove the cover for spot cleaning or washing per fabric care instructions. Unroll the buttons as instructed to access the inner fill when needed. Fluff the pillow after use to maintain loft and support. This triangle back cushion cover provides reliable ergonomic support, easy maintenance, and flexible placement across beds and seating areas for everyday comfort.