Casper is reimagining sleep from the ground up. All of Casper’s sleep products are developed in-house by our award-winning research and development team. The Casper Original Hybrid mattress has three layers of premium foam that provide all-night comfort through our innovative support system. Plus springs for added lift and airflow. Our Zoned SupportTM helps align your spine with head to toe support; softer under shoulders, firmer around hips, waist and lower back. Breathable open-cell foam layers allow airflow to soothe you to sleep. Premium foam is plush yet resilient and conforms to your body to relieve pressure. 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. The Eco-friendly cover is made with recycled materials. It's designed to withstand years of use. The knit mattress covers have four way stretch, so you feel the full benefits of the below layers. Foams are made without ozone-depleting chemicals.Still unsure? Rest easy with our 100-night trial and free returns.