Shop King Firm Mattresses

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The firm king size mattress, which measures 76" wide by 80" long, is roomy enough for a couple to sleep comfortably with space to spare. Firm beds provide great support for back and stomach sleepers, with just enough give to accommodate most side sleepers. Since firm mattresses are easier to stand on, children tend to prefer them in cribs and transition beds during the years when they're first learning to walk.

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  • NEW AT MATTRESS FIRM

    $119.20 - $199.20 $149.00 - $249.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • NEW AT MATTRESS FIRM

    $239.20 - $399.20 $299.00 - $499.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

    $191.20 - $311.20 $239.00 - $389.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

    $207.20 - $351.20 $259.00 - $439.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $319.20 - $439.20 $399.00 - $549.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $119.20 - $199.20 $149.00 - $249.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH