Extended Life 400 Cushion Firm

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What is Sleep iD?

Sleep iD is the result of extensive research between King Koil and the ICA. We have analyzed hundreds of people of all body types with varying sleep habits to learn which mattress construction properly supports different profiles of sleepers.

Launch Sleep iD

Comfort Index

We understand finding the right comfort surface is a personal preference and may vary among retailers. To achieve the right feel for you, we suggest you determine your needed support through Sleep iD and rest test mattresses at your nearest King Koil dealer.

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Twin $2,699.00
TwinXL $2,749.00
Full $2,749.00
Queen $2,799.00
King $3,199.00
California King $3,199.00

Price includes boxspring.
See store for mattress only price.

The Extended Life 400 luxury firm mattress features a removable duvet featuring layers of Plush Conforming Latex.

The duvet is built so well in and of itself that it may last a lifetime.

Now we take this incredible duvet and add the ultra supportive Extended Life Performance system which consists of 450 extra strength coils for one of the most durable mattresses around.

Then we place this mattress on one of the best-built foundations in the industry, our Superior foundation which offers the ultimate in durability while delivering support to the King Koil 400 mattress set.

  • Top Panel: Super High Density Foam
  • Bottom Quilt: Safeguard Fiber
  • Bottom Panel:Super High Density Foam
  • Upholstery:Plush Conforming Latex
  • Coil:Extended Life Performance System
  • Edge:Excellent Edge™ Foam Encasement
  • Base:Enhanced Balance Base Foam
  • Foundation:Amish-Made Superior Foundation
  • Warranty:25 Year Warranty

Superior High Density Foam

A strong and durable foam providing the ultimate in long-lasting support.

Excellent Edge™ Foam Encasement

Provides greater stability, a firm seating edge, and 10% more usable sleeping surface.

Extended Life Foundation

With 3x the amount of wood beams, an additional center rail and increased edge support, this high quality wood design surpasses any other conventional wood-build foundation creating a superior stabilizing and extra durable system for an extended life performance.

eXtended Life Performance System

This innerspring has been designed to last! Stronger, heavier-gauge-interlocking-coils are designed to increase the support for a long-lasting performance.

Cushion Firm Latex

Natural latex provides the ultimate in pressure-relieving comfort and support.

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