ABOUT THE COLLECTION:Every Helix mattress is handmade by skilled professionals in our Phoenix, Arizona facility. By owning and operating the facility where our mattresses are made, we are able to provide the highest quality materials and American-made craftsmanship each and every time. The Twilight is designed with more comfort, more support, and more cooling technology than ever before. View all mattresses in the Helix collection. QUILTING LAYER:The Twilight mattress is made with our Breathe Knit fabric, offering sleepers a soft, breathable feel on the surface of the mattress. Firm Gel Memory Foam provides a pressure relieving feel that cradles your hips and shoulders. Materials: 0.75" Gel Memory Quilt Foam COMFORT LAYER:Responsive Foam with a high degree of firmness is designed to cradle and contour to your body for optimal support & comfort. A secondary layer of Responsive Foam with a high degree of firmness level provides additional ergonomic support and cushioning. Materials: two layers of Responsive Foam SUPPORT DETAILS:Hundreds of individually wrapped steel coils support sleepers and limit motion transfer. Two reinforced lengthwise edges provide support and cradle sleepers comfortably. Materials: Steel coils