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. The top layer of AirScapeTM perforated breathable foam increases airflow and circulates air to keep you cool at night. 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. 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.