● 5 zones spinal-protecting system conforms to the comfort demand . According to the human body mechanics,head part creates 10% of body force at sleeping posture,back-hip with 75%.and legs with 15%. ● Knit with OEKO-TEX certified ,soft and breathable style suits every seasons.● Latex foam with good chemical stability and heat resistance, resistant to decomposition and deterioration.● With 5cm Premium foam in comfort layer supply high rebound,good physical stability ,good heat dissipation.