The 17.7x 17.7 inch size is suitable for the standard weight of people. It has a non-slip bottom and strap design to keep it in place. Safe and reliable. Relieves Pain and Discomfort: The chair cushion pad adopts a large fan-shaped waist protection design, which can keep your waist warm. The fan-shaped waist protectors on both sides not only ensure that your waist and spine are well supported and wrapped when sitting in a chair, but also protect your waist from freezing in the cold autumn and winter seasons, effectively preventing your waist and spine from getting cold. Premium Quality: It uses high-grade crystal velvet material and PP fabrics, it protects your spine and bottoms from catching a cold in winter. Soft and fluffy, it will not deform over time. Available on Both Sides: The cushion can be used on both sides, which is lightweight and soft, keep you comfortable and warm in autumn, winter. The inner core is made of high-quality PP cotton, which has better softness, fluffy feeling, good resilience. Widely Usage: Whether it is placed on the seats of the dining room, study, bedroom, and office, or on the ground, bed, and car, the cashmere cushion can warm the whole heart. It adopts the foldable routing design, which can be folded and stored when not in use, saving space.