Dedicated lumbar support The Zinus Lumbar+ delivers all the benefits of memory foam you'd expect — contouring comfort, personalized support, and absorbed movement for undisturbed sleep — with one meaningful addition. A dedicated 3-zone lumbar support layer is built directly into the mattress, with three distinct firmness zones that respond differently across the width of your lower back to provide targeted reinforcement where your body needs it most. All the comfort of memory foam, with an extra layer of support built in. Built for your body, layer by layer Contour Gel Memory Foam responds to your unique shape and weight, relieving pressure points across your body while refreshing airflow keeps things cool. Green Tea Memory Foam adds natural freshness and a second layer of contouring comfort. Transition Foam beneath it provides steady, reliable support, and Zinus Base Foam anchors everything with durable, long-lasting structure. Above it all, a cool-to-the-touch cover helps regulate temperature from the very first night. Medium firm: elevated and balanced Not too soft, not too stiff. The Lumbar+ medium firm feel is designed to keep you supported and aligned while still offering the cushioning comfort your body craves. Whether you sleep on your side, back, or stomach, the layered construction adapts to work with you — not against you. Safe for your home, certified by experts This mattress contains no fiberglass. Foams are CertiPUR- US® certified and the cover meets OEKO-TEX® Standard 100 — independently verified to be free from formaldehyde, heavy metals, and harmful chemicals. The kind of safety standard worthy of your primary bedroom. Setup is simple Unbox, unroll, and let it expand for 24–72 hours before sleeping on it. Pairs with most platform beds, box springs, and adjustable bases.