King Koil Standard ( 9″ ) Box Spring – Twin Extra Long


King Koil provides a strong foundation for your bed, designed for lasting support with the Semi-Flex™ steel design of its Austen Flex Steel Box Spring.

  • Construction: Flex Steel
  • Semi-Flex™ design
  • Warranty: 10-year
  • Box springs cannot be paired with an adjustable base
  • This box spring arrives in two pieces. Split box springs make it easier to maneuver through narrow stairwells, elevators and door frames.
  • Made in the USA of imported and domestic parts

Please allow 1 to 2 weeks for the special order products to arrive

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Additional information



Available Sizes

Twin Extra Long


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SKU: 7443KK-7020 Category: