King Koil Duet Ultra Firm

A better night’s sleep starts with the King Koil Signature Duet Ultra Firm Tight Top.

Featuring 630 pressure relieving encased coils, a layer of cooling gel memory foam and moisture wicking Tencel™ fibers woven into the sleeping surface. You’ll enjoy many restful nights.

PureCare Silver five Sided Mattress Protector

from $94.99

get it Delivery date contingent on available inventory

Healthy Sleep Ultra-Tech Advanced Pillow

from $99.99

get it Delivery date contingent on available inventory

Add it

subtotal:

$999.99

get it Delivery date contingent on available inventory

Local
Delivery

Delivery and set up is included for free for all orders greater than $399 and if within 25 miles of any Sit ‘n Sleep store.

We will also "haul away" your old mattress and box spring upon delivery of your new order: Just let us know!

Next day delivery on available inventory. Not applicable for UPS and FedEx orders. See our COVID-19 page for more information.

120-Night Sleep Trial

Buying a new mattress is not something you do everyday. Our 120-night sleep trial and comfort guarantee means you can rest easy.

10 Year Warranty

You spend a third of your life asleep on your mattress. Shouldn't you at least lay on it first? Come visit one of our 39 store locations and get comfy with your purchase.

Mattress Removal

We will "haul away" your old mattress and box spring upon delivery of your new order: Just let us know if you would like this service.

Add a Base and Frame:

Knickerbocker Promo Frame

from $67.00

get it Delivery date contingent on available inventory

On Sale

Infinity Platform

from $349.99

$299.99

get it Delivery date contingent on available inventory

New Arrival

Sealy Ease 4.0 Adjustable Base

from $914.00

get it Delivery date contingent on available inventory

Have Questions?

We're here to help. Give us a call or visit your local store.

Firm

Key Feature

630 pressure relieving encased coils

Ready for Your Best Night’s Sleep?

Super Stretch Tencel Fabric

  • moisture wicking
  • natural & breathable
  • sustainable

King Koil Signature HD Firm Foam

  • durable construction
  • cradling comfort

630 Contour Luxury Encased Coil System

  • reduces motion disturbance
  • conforms to body’s curves
  • relieves body pressure points

Mattress Height (Approx.) 13”
Mattress is adjustable friendly - works well on motion bases
10 Year Warranty
Proudly designed & built in the USA since 1898

Better rest meets peace of mind in the King Koil Signature collection. Designed to provide a luxurious sleep experience, thoughtful details merge with premium features for optimal comfort and all-night support. The Signature mattress collection utilizes advanced coil technologies to promote better posture alignment while specialty foams regulate temperature and dispel motion for a deeper night’s rest for all.
Approx.
Twin 38" x 75" x 13"
Twin XL 38" x 80" x 13"
Full 54" x 75" x 13"
Queen 60" x 80" x 13"
King 76" x 80" x 13"
CA King 72" x 84" x 13"

What Customers Are Saying