· Can this cushion effectively relieve lower back pain, coccyx pain, or sciatica? Yes.It is specifically designed for people who sit for long periods.It significantly reduces pressure on the lower back, coccyx, and sciatic areas, helping to alleviate related discomfort.

· Will the memory foam collapse or lose support after prolonged use? No.Made of high-density memory foam, this cushion maintains its shape and elasticity even with daily use.It will not compress thin or lose its supportive properties over time.

· What types of chairs or seats is this cushion suitable for? It has a wide range of applications, including office chairs, car seats, wheelchairs, and airplane seats - compatible with almost all common seating surfaces.

· Is the cushion large enough for bigger users? The cushion measures 17.5" * 14.5" * 3"(Thickness range: 2.4'’ - 3'’(thickest point)) , making it suitable for medium‑sized body frames.It may be too small for users with larger hips.Please check the dimensions before purchasing.

· Is the cover removable and washable?How should I clean it? Yes, the cover is removable and machine‑washable for easy hygiene. The memory foam core should never be washed with water - simply air it out in a well‑ventilated area.