A new, pressure-relieving hybrid mattress, the Serta Perfect Sleeper Tranquil Wave 11-In Medium Hybrid Mattress-In-A-Box delivers relaxing, pressure-relieving comfort and cradling support to your front door. With HexCloud Gel memory foam, you’ll be provided with cooling support like never before. We bumped up the support with our individually-wrapped coil technology so you can rest easy knowing that Serta has got your back, all night long. With a 10 year limited-warranty and CertiPUR US certified foams, you can be rest assured that your Serta mattress has got your back. We pack these high-quality mattresses in fuss-free cartons so you can simply unpack, unroll, and unwind. Serta Perfect Sleeper Tranquil Wave 11-in Soft Twin Extra Long Hybrid Memory Foam/Coil Blend Mattress in a Box in White | 500300178-1020