Casper original foam mattress is the perfect combination of support and cooling. Our zoned support TM has 3-areas of targeted support for proper spinal alignment. Soft foam around the shoulders provides more relief to the upper body. Firmer foam under the hips, waist, and lower back help align your spine. AirScapeTM is present in the top layer of the mattress. The perforated breathable foam helps reduce heat. Tiny holes move hot air and body heat away, keeping you cool throughout the night. This premium foam is plush, yet resilient and conforms to your body to relieve pressure. The durable base foam prevents sinking and sagging and supports the whole body. The cover is made with recycled materials and easily zips off. It's designed to withstand years of use. The knit mattress covers have 4-way stretch, so you feel the full benefits of the below layers. Size: california king. Color: Gray. Material: Memory Foam.