1. Firm and Supportive This car seat cushion is made of high density memory foam, not very soft, mainly to help support the tailbone and lumbar, as well as elevate your upper body by 3.9in when your seat is lower, giving you a broader and higher view. (This is especially important when you drive a car with a low seat.) 2. Multi Purpose Memory Foam Pad Measuring 17.5 x 9.8 x 3.9in (Length x Width x Thickness), this memory foam pad can be a seat cushion for cars/office or lumbar support pillow. It is suitable for all kinds of people such as students, office workers, entrepreneurs, drivers and so on. 3. Back Pain Relief This seat cushion is ergonomically designed to fully fit the curve of the lumbar and hip areas, providing protection and support in the lumbar and hip areas, ensuring long sitting without fatigue and relieving pain in the lumbar and tailbone areas. When you're ready for a long car/bus/train trip or a long drive, take it with you! 4. Premium Material This lumbar pillow is made of one time molding of high quality memory foam, moderate softness, long term use will not collapse. The outside cover is a mesh material, soft and breathable, removable and washable. The back has adjustable straps, which can be adjusted according to the size of the seat to help fix the cushion.