Whether you?re an early riser or night owl, the Holst Medium mattress is designed to support you unconditionally. Genuine Support - It all begins with a precisely engineered spring system, developed by our team of experts and totally unique to Sealy. The AlignSupport? coil is our patented spring technology where neither comfort nor support are compromised. Its unique geometry senses your body as it meets the mattress, providing the initial response. Followed by deep down support that sits at the very heart of the coil to evenly distribute your body?s weight. It?s twice tempered too, providing dependable performance, year after year.