This mattress features innovative ergonomic zones and a medium-firm support that's great for spinal alignment whether you're a side, back or stomach sleeper. Comfort Zone 1 features soft coils that provide pressure-point relief, allowing the shoulder to sink. Support Zone features firm coils that reinforce the back and hips. Comfort Zone 2 has soft coils that keep your legs and spine perfectly in line.Type: Foam-free innerspring. Contains 5x the coils of a standard mattress. Support level: Medium-firmOther features: No box spring needed. Free of toxic chemicals, adhesives and off-gassing substances. Mattress layers are breathable, promoting airflow so that the body doesn't overheat. Minimal-motion transfer isolates motion, meaning you won't be bothered by movement during the night. Rotate every six months. Do not flip. Spot clean as needed. Twin: 38" x 75" x 12" Twin XL: 38" x 80" x 12" Full: 53" x 75" x 12" Queen: 60" x 80" x 12" King: 76" x 80" x 12" California King: 72" x 84" x 12" Base layer: Bottom wool insulated pad of sustainable, hypoallergenic, flame-resistant wool protects the bed frame from the pocketed coils Stability layer: Soft and firm pocketed coils create comfort, stability, and support zones, allowing for proper spinal alignment Mid layer: A layer of sustainable, hypoallergenic, flame-resistant wool protects the microcoils from the pocketed coils Microcoils: Three tiers of tiny steel coils react individually to pressure, contouring to your body and isolating its every move Comfort layer: Two sheets of pure New Zealand wool naturally regulate body temperature and keep you cozy Cotton cover: quilted 100% organic cotton for a soft finish Organic cotton/recycled tempered steel Spot clean Made in the USA of imported materials