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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  • $383.36 - $767.36 $599.00 - $1,199.0 (up to 36% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $575.36 - $831.36 $899.00 - $1,299.0 (up to 36% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $1,727.36 - $2,239.36 $2,699.00 - $3,499.0 (up to 36% off)
     or as low as  $46.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,999.00, excluding tax and delivery charges, for 48 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • 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
  • NEW AT MATTRESS FIRM

    $479.20 - $719.20 $599.00 - $899.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • NEW AT MATTRESS FIRM

    $639.20 - $879.20 $799.00 - $1,099.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • NEW AT MATTRESS FIRM

    $879.20 - $1,199.20 $1,099.00 - $1,499.0 (up to 20% off)
     or as low as  $49.97/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $999.00, excluding tax and delivery charges, for 24 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $1,039.20 - $1,519.20 $1,299.00 - $1,899.0 (up to 20% off)
     or as low as  $42.20/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,299.00, excluding tax and delivery charges, for 36 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $559.20 - $879.20 $699.00 - $1,099.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $3,199.20 - $3,839.20 $3,999.00 - $4,799.0 (up to 20% off)
     or as low as  $53.32/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $2,799.00, excluding tax and delivery charges, for 60 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $1,999.20 - $2,719.20 $2,499.00 - $3,399.0 (up to 20% off)
     or as low as  $41.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,999.00, excluding tax and delivery charges, for 48 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $2,479.20 - $3,199.20 $3,099.00 - $3,999.0 (up to 20% off)
     or as low as  $46.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $2,799.00, excluding tax and delivery charges, for 60 months at 0% APR*. Learn more.
    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
  • $460.00 - $760.00 $575.00 - $950.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $1,279.20 - $1,919.20 $1,599.00 - $2,399.0 (up to 20% off)
     or as low as  $40.25/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,299.00, excluding tax and delivery charges, for 36 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $1,649.00 - $2,499.00
     or as low as  $41.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,999.00, excluding tax and delivery charges, for 48 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • NEW AT MATTRESS FIRM

    $799.00 - $1,299.00
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $1,679.20 - $2,399.20 $2,099.00 - $2,999.0 (up to 20% off)
     or as low as  $41.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,999.00, excluding tax and delivery charges, for 48 months at 0% APR*. Learn more.
    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
  • ONLY AT MATTRESS FIRM

    $1,919.20 - $2,879.20 $2,399.00 - $3,599.0 (up to 20% off)
     or as low as  $41.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $1,999.00, excluding tax and delivery charges, for 48 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • ONLY AT MATTRESS FIRM

    $2,799.20 - $3,519.20 $3,499.00 - $4,399.0 (up to 20% off)
     or as low as  $46.65/mo All monthly payments are rounded up to the nearest whole dollar. +Monthly payment is based on minimum purchase price alone of $2,799.00, excluding tax and delivery charges, for 60 months at 0% APR*. Learn more.
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH