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The Mattress that Fits You Perfectly Every Night for the Rest of Your Life

Our patented body sensing technology continuously adjusts to your unique profile, providing the perfect amount of comfort and support for a better night's sleep.

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Body Sensing Technology

Our patented body-sensing technology calibrates to your unique body type and sleep position, automatically adapting to your specific needs.

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Adaptive Support

40 Smart Cells and 4 independent zones per sleeper adapt to the needs of your unique body type and sleep position.

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Personalized Comfort

Each sleeper can choose from a choice of 9 comfort settings, ranging from firm to soft.

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Relaxation Mode

Smart Cells can be set to gently pulse support in a comforting wave motion.

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Sleep Data

Our proprietary SmartLife App monitors your sleep and provides sleep data.

King Koil Collections

A Smarter Way To Sleep

See How SmartLIfe Compares to Sleep Number

King Koil Mattresses – Revolutionizing Sleep

No More Compromises

With the SmartLife mattress, both you and your sleep partner will each get the perfect combination of support and comfort, even if you have different sleep positions or preferences.

Each of you can select your preferred comfort setting for your own side of the mattress, ranging from firm to soft.

Even if you move or turn in your sleep, the SmartLife mattress senses your movements and silently adapts the support to suit your position.

Adapts to You

Even if your body changes over time…gain weight, lose weight, get pregnant, undergo surgery…no matter what happens, your SmartLife mattress will adapt to your needs and provide the perfect combination of support and comfort.

SmartLife – the mattress that fits you perfectly every night for the rest of your life.

Customer Talk on King Koil

Our Customers Love Us And We Love Them!

John listened to my need and cost and looked at my choice of mattress. I loved how he did not try to sell me another mattress. No pressure! John answered all my questions and arranged to have my mattress delivered on Monday-it's Saturday.
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JessTheBest I.


My boyfriend and I went in not knowing what we wanted Both the sales people that helped us were very knowledgeable and very helpful I would highly recommend Mancinis Sleepworld Novato
Kelly Sanchez


Myyyy goodness! My husband and I laid on about ten mattresses and swapped back and forth between two of them many many times. At no point did we feel pressured to hurry up and make a decision! The customer service was incredible and Brandon made sure that we were getting what we wanted and understood the differences between each mattress! I highly recommend anyone not sure of what they want or 100% sure of what they want to go to Mancini's Sleepworld in Concord!!!
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Emily Greenhouse


Craig "Dino" made our mattress purchase an easy and great experience. Dino was very honest and his customer service was great. Thank you for selling us a good quality mattress with no hassle.
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Alfredo M.


Try Before You Buy!

Find Mancini's Sleepworld store nearest you to try the mattresses before buying!

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Frequently Asked Questions

How do I know if I need to buy a new mattress? 

A mattress has an average lifespan of 6 to 8 years. However, if you feel that your mattress is not providing you with sufficient comfort and support, or notice a sag in your mattress, then you should consider buying a new mattress. Waking up with aches and joint pains is also an indication that you probably need a new mattress. 

Where can I find a King Koil mattress near me?

If you are shopping for this mattress, visit Mancini’s Sleepworld and find a mattress of your choice at the best price. We also offer free local delivery and can help you set up your new mattress.

How does the sleep management system of a King Koil SmartLife mattress work?

The sleep management of this SmartLife mattress allows you to track your sleep and manage comfort settings. The system uses WiFi and Bluetooth to store information, and you can access it using the Smart Life app to track your daily, monthly, or yearly sleep data.

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