Product Features: 1. Great ergonomic design to fit human legs and hip lines evenly distribut ing body and hip gravity, to allow natural extension of human back and cor rect sitting posture, substantially reduce the burden on the waist 2. The inner layer with special low -rebound materials, can reduce and release the spine pressure, even up the gravity under the hip, to prevent sedentary pain and discomfort after long sitting. 3.Heat conductivity is low, temperature increase is slow, maintain the cushion temperature below 32 ℃ ; recommending at least every hour get up and stretch your body to promote blood flow and let the cushion release heat. 4. Enlarge ordinary small cushions to big size therein to improve supportiveness , and reduce sedentary fatigue The outer fabric covers can be taken apart, washable, and durable Patent Number: 296640