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features: one. curve 3d: according to the natural curve of the human thigh, dual concave design prevents compression and deformation. after sitting, the coxim has no expansion to prevent smooth sedentary buttocks deformation. 2. beware of flow vertebra: in order to pursue a better sense of comfort, we are constantly improving and improving the cushion of all aspects, just to give you a comfortable sedentary experience and feel the hip sensation relaxation. three. reasonable thickness: the t