PERSONALIZED SUPPORT: 3 select foam layers provide tailored pressure relief and targeted ergonomic support to make this the perfect option for SIDE SLEEPERS and toss and turners. BREATHABLE: Breathe Knit cover pillow top for excellent airflow. COMFORT: Hundreds of individually wrapped steel coils and reinforced side perimeters to cradle sleepers and limit motion transfer. FIRM FEEL (Twilight): Firm premium layers contour to your body while reducing sink into the surface; 8-9 out of 10 on firmness scale with 10 being the firmest. EASY SET UP: Compressed and rolled for easy and convenient parcel shipping and set up. The Helix Twilight is our firm model recommended for side sleepers and people who toss and turn at night. The mattress features memory foam with a dense foam feel and supports spinal alignment by providing pressure relief at your hips and shoulders.