Extended Life 300 Medium 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 $1,899.00
TwinXL $1,949.00
Full $1,949.00
Queen $1,999.00
King $2,399.00
California King $2,399.00

Price includes boxspring.
See store for mattress only price.

The King Koil Extended Life 300 Medium Firm is built like a body builder, with its strength bursting out from head to foot.

The 300 uses ventilated layers of Cushion Firm Latex to accomplish a level of comfort and durability not presently offered in any mattress products.

The core of this mattress includes the Extended Life Performance System with 450 extra strength coils to help withstand and respond to heavy weight capacities for years of long lasting support.

  • Top Quilt: Safeguard Fiber
  • Top Panel: Super High Density Foam
  • Upholstery:Cushion Firm Latex, Extended Life Foam
  • Coil:Extended Life Performance
  • Edge:Excellent Edge™ Foam Encasement
  • Base:Enhanced Balance Base Foam
  • Foundation:Superior Foundation
  • Warranty:25 Year Warranty

Cushion Firm Perfect Contour Foam

Extra Firm conforming foam to reduce pressure points

Superior High Density Foam

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

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.

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.

Cushion Firm Latex

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

Resilient Foam

Provides additional highly resilient firmness and support.

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