Two layers of latex (4" and 2") "sandwich" one layer of palm coir (2") to create a "cushion" for those used to sleeping on a mattress that absorbs the body's movements. Great for people who frequently toss, turn and roll around. Offers the option to sleep on the plush side, or the firm side for days when your body needs more support. Provides excellent ventilation, spring action and shock absorbance. Pure comfort and bliss!