Feature: This Bravo B7 cushion is designed according to human sitting engineering. Its curve perfectly fits the back of the waist, so that you consciously stand upright when working. The cushion is designed according to the muscle distribution of the scapula that giving the shoulder and spine a certain amount of support. The lower memory foam of back cushion is thicker, better stick to hold the waist and make you feel like two hands to hold in the waist. The outer cover is 95% polyester which is durable and soft. The inner core is bamboo charcoal memory cotton, even if used for a long time will not have peculiar smell.