Casper Original Hybrid Mattress, King

-Top Layer: 1.5" of Polyurethane Foam - A layer of AirScape perforated breathable foam increases airflow and circulates air so you don't get hot at night -Middle Layer: 2" of three-zone memory foam - Memory foam with 3 areas of Zoned Supportitis help align your spine and relieve pressure. This makes the mattress softer under your shoulders and firmer around the hips, waist, and lower back. -Bottom Layer: 7" of Polyurethane foam encasement tub with coil unit - Resilient springs add a little lift, support, and airflow to the mattress of your dreams. A firmer border provides edge support to help you get in and out of bed easily. -Fabric Content: Recycled Polyester / Polyester / Upcycled Cotton / Rayon / Lycra There are up to 57 recycled bottles in each cover -Hybrid Mattress, sizes Twin-California King -Certified by our Sleep Lab -100-night trial -10-year limited warranty