50D Slow Rebound Memory Foam50D slow rebound memory foam is a high density, high performance, physical therapy memory foam. it is heat sensitive, slow rebound foam, odorless and does not flatten overtime like others. Orthopedic Design Do you feel very stretched and have lower back pain after sitting for a long time? Memory foam back cushion simulates the human body's S-curve, fits your lower back perfectly, helps you relieve back pain and correct your sitting posture. High Quality and Warranty Unlike many lumbar pillows which use gel, nappies and other inefficient materials, memory foam pillows use thick, high density memory foam that holds its shape. In memory foam, it is normal for the cushions to become harder at low temperatures. Cushion softness will be adjusted according to user's temperature or environment. Wide Range Application With adjustable and flexible strap, ergonomic chair cushion is suitable for office chairs, chairs cars, wheelchairs, all seats or seats of buses, planes or trains. What's more: This pillow could be a special gift to your family/friends/Co-Works in Festivals Season like Christmas/New Year. Guaranteed and Prompt Response In After-Sales Service If there has product quality problems within six months, please contact us, we will reply messages within 24 working hours and help you return for free.