The Serta iComfortECO S30LXT medium 13.75” hybrid mattress offers support with a smooth, memory foam feel. The cushion firm comfort level is great for back and stomach sleepers. The TerraFusion™ memory foam layer is made from 30% plant-based material that provides pressure relief and reduced motion transfer for uninterrupted sleep. The responsive Latex layer contains 20% natural latex that’s breathable and supportive. The 1000 Series 5-Zone quad coil support system is made from 85% recycled steel and delivers targeted pressure relief for you’re your back and thighs. Powered by REPREVE®, the cool-to-the-touch, CoolTemp™ cover is breathable and made from recycled plastic bottles. CertiPUR-US certified to be free of harmful chemicals and gasses. Mattress protector recommended. Made in the USA. Compatible with adjustable bases and Serta iComfort foundations.