Best Mattress is devoted to giving you a better night’s sleep. We hand-select all of the mattresses we have in store and only choose those brands that you can trust. King Koil is one such mattress company that we are proud to represent. This company has years of experience providing high-end luxury mattresses for its customers. They have a wide range of specialty mattresses to accommodate a wide variety of sleeping needs.
Why Choose King Koil?
King Koil is one of the major players in the mattress game and has been around for a very long time. The company was originally known as US Bedding and they started producing mattresses way back in 1898. Customers around the world have benefited from the high-quality comfort of their mattresses since then.
If you’re looking for a new mattress for your bed, the King Koil mattress is a wise choice. And with the King Koil SmartLife Lily SmartLife Medium mattress, you’ll get optimum rest and a better night’s sleep.
Why Choose The Lily SmartLife Medium Mattress?
Using patented Smartlife technology, King Koil has developed the Lily SmartLife Medium mattress. It adjusts to your size and adapts to the way you move in bed. It contours to the shape of your body and offers support and comfort, right where you need it the most. It’s something you need to try out for yourself, and you can do so by visiting us in-store.
The Lily SmartLife Medium mattress uses Smartlife’s Smart Cell Technology. This technology includes over 80 individual Smart Cells and eight independently controlled zones to provide support and comfort. The attached remote control or the SmartLife app allows you to adjust your mattress to a personalized position. This will give you the best night’s sleep possible, with the proper support and pressure relief that your body needs.
You can use the Smartlife Relaxation Mode to gently ease you out of bed in the morning with a soothing wave motion. This can start your day on the right foot feeling fully refreshed and ready for the day ahead.
Using the Smartlife app, you can also track your sleep remotely. You can measure the way you sleep each night and view your daily, monthly, and yearly sleep statistics. You can then program it to give you better comfort control, with a range of features to optimize your sleeping pattern.
With the revolutionary Smartlife technology, you can experience your Lily SmartLife Medium mattress your way. You need never have a bad night’s sleep again, so if you’re looking to replace your old mattress, this technological marvel from King Koil might be your number-one choice!
Product Features
Responsive Memory Foam
This superior 4#RMF™, high-density memory foam responds and conforms to your body. It evenly distributes weight to prevent pressure points and gives you the chance of a better night’s sleep.
HypurAir Gel Infused Memory Foam
The highly resilient gel-infused memory foam responds and adapts to your body’s movements. The HypurAir Gel gives you the optimal sleeping surface temperature. Increased airflow is enabled due to strategically placed perforations, meaning you won’t become too hot when lying in bed.
Patented Body Sensing Technology
The ioBED Core Technology featuring Smartlife’s patented Body Sensing Technology will automatically adjust to your body shape, weight, and height. It continuously monitors you as you sleep, and adjusts to your position to ensure proper support and pressure relief. All of this is to aid you in a perfect night’s sleep.
Smart Cell Technology
A better night’s sleep is guaranteed thanks to Smart Cell Technology. The 80 individual Smart cells and 8 independently controlled zones relax your body from head to toe. The technology includes a number of features that can be accessed via the remote control and corresponding app. These include:
- Independent firmness controls to provide individualized comfort and support
- Sleep tracking, with an overview of your daily, weekly, monthly, and annual sleeping patterns
- A smart alarm that allows you to wake up peacefully with a gentle soothing motion to your body
- A massaging relaxation mode that can be used at bedtime or when you’re in need of some stress-relief
The King Koil Lily SmartLife Medium Mattress
We think you will agree with us when we say this mattress is one of the best. With the SleepLife technology to improve sleep, the high-density memory foam for added comfort and the 25-year manufacturer warranty for extra peace of mind, you won’t be disappointed with the King Koil Lily SmartLife Medium mattress.
Product Specifications
Proudly designed and handcrafted in the USA.
Measurements
- Mattress Height: 12″
- Queen: 60″ X 80″
- King: 75″ X 80″
- California King: 72″ X 84″
Comfort Design
- HypurGel
- 4#RMF (responsive memory foam)
Support Design
- Body Sensing Technology featuring Smart Cells
- Foam Encasement
Shop Online or In-Store
At Best Mattress we understand that it can take time to choose a new mattress. That’s why our expert team is here to help every step of the way.
We have a wide range of mattresses available, including the King Koil Lily SmartLife Medium mattress. Browse our website, give us a call or visit us in-store. We’ll match a mattress to your personal needs and give you the opportunity to try out our mattresses for yourself.
You deserve a better night’s sleep, so contact us, and let us help you achieve the blissful night’s slumber you are longing for.

Delivery and Shipping
SAME DAY DELIVERY
In-stock merchandise purchased by 1 pm will be delivered the same day upon request, excluding holidays and limited to a geographic area with a minimum purchase of a $599 mattress set. Excludes floor models. See store for details.
DELIVERY
The room must be ready for delivery when the drivers arrive.
As a service, we will remove your old mattress and box spring before delivering the new set (subject to inspection, unsanitary bedding will not be removed, limited to equal amount delivered).
As a service, we will remove your old mattress and box spring before delivering the new set (subject to inspection, unsanitary bedding will not be removed, limited to an equal amount delivered).
Delivery cannot be made to a minor and finance orders will require a signature from someone with a valid state-issued ID.
The driver will call the phone number provided on your order on the morning of delivery to give you a three-hour time frame. If you are not home for a delivery, there will be a $69.99 re-delivery fee.
If the driver determines that the delivery attempt could cause damage to your home, you will be required to sign a release of liability to complete the delivery.
Our C.O.D. Policy:
All orders must be paid in full before the delivery date. We do not accept payment at the time of delivery.
Warranty & 120-Day Sleep Guarantee
10-Year Limited Warranty
Beautyrest stands by its products and materials with limited warranties so you rest easy.
Our-120 Day Sleep Guarantee
If you have owned your mattress for longer than 30 days and you aren't happy with your set, Best Mattress is glad to exchange your mattress for 120 days from the date of purchase. Please see our full terms & conditions here.
Best Mattress also offers FREE REMOVAL* of your old mattress. Our delivery driver will pick up your old mattress and seal it in plastic before loading it onto our truck.
Need financing? We have you covered! Best Mattress offers a variety of options available, including No Credit Check Financing! Please contact us for additional details on all offers.
We appreciate your patience, understanding, and support at this time. Thank you for continuing to be a loyal Best Mattress customer. Sleep Easy, Friends!
Available Bed Sizes
See our mattress sizes and dimensions page.
Queen 60″ X 80″ |
King 76″ X 80″ |
Cal King 72″ X 84″ |
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