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. COOLING: Cool-to-the-touch GlacioTex Cooling Cover to keep you cool and comfortable. 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. RISK FREE: Our 100-night sleep trial and Limited Lifetime Warranty demonstrate our confidence in the quality of our products and our dedication to providing you with ongoing support. 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.