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: TENCEL premium quilted pillow top for extra comfort designed to maximize airflow. ENHANCED COMFORT: Up to 1,000 individually wrapped steel coils with targeted zoned lumbar support helps with spinal alignment and back pressure relief + reinforced perimeter cradless sleepers and limits 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. ONLY THE BEST MATERIALS: This bed in a box mattress is Fiberglass-free, GREENGUARD Gold certified, and made with CertiPUR-US certified foams. Each mattress is carefully assembled in our own Arizona facility and delivered right to your door. We want you to be happy with your mattress and that's why we offer a 120 night sleep trial and a Limited Lifetime Warranty. Go beyond one size fits all and find a luxury mattress that’s made for your unique sleep preferences. The Helix Twilight Luxe is our firm premium mattress for side sleepers and people who toss and turn. It is considered an 8-9 on the firmness scale with 10 being the firmest