Seville 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
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A perfect balance of comfort and deep down firm support is found in the King Koil World Edition Seville Firm. This mattress features a 7,” 630 Balanced Support coil system, high performance foams and gel-infused memory foam, King Koil’s iFusion™ technology.


All King Koil products are proudly designed and built in the USA.


Also available in a pillow top model.


  • Upholstery:iFusion™ Technology
  • Coil:Balanced Support Coil System™
  • Edge:Excellent Edge™ Foam Encasement
  • Base:Densified Fiber Pad
  • Foundation:Natural Wood Foundation
  • Warranty:10-Year Non-Prorated

Expanded Sleeping Surface

Our Excellent Edge™ Foam Encasement provides greater stability, a firm seating edge and larger, more usable sleeping surface.

Temperature Regulation

Our iFusion™ Technology is combination of open cell memory foam and pressure relieving gel resulting in an optimal temperature sleeping surface while still conforming to every curve of your body.

Proudly Designed and Built in the USA

All King Koil products have been designed in the USA since 1898.

Balanced Support Coil System

Our Balanced Support Coil System has a continuous coil innerspring design which adjusts instantly to your sleep movements,  naturally comforting and supporting your body to reduce motion disturbance.

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