Serta has joined forces with the National Sleep Foundation (NSF) to introduce the all-new Perfect Sleeper, the first official mattress of the National Sleep Foundation. The new Perfect Sleeper is engineered with input from the NSF to help solve many of the most common causes of poor sleep. Each Perfect Sleeper is designed with a set of unique features to help address not just one issue, but 5 common sleep and mattress issues that people face every night: 1. Tossing and turning 2. Lack of support, leading to back pain 3. Sleeping too hot or too cold 4. Partner disturbance 5. Mattress roll-off or sag Plus, only Serta is working with the NSF to help people improve the quality of their sleep through both optimal mattress design and enhanced sleep education. Every new Serta Perfect Sleeper mattress comes with the National Sleep Foundation's exclusive Guide to Sleeping Well. This informative booklet provides tips, suggestions and resources to help you get the most from your new Perfect Sleeper mattress each and every night. The traditional Firm model offers classic tailoring with fewer plush comfort layers at the sleep surface than our other models, so you will feel the support system more prominently when you lie down.