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Shop King Extra Firm Mattresses

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The extra firm king mattress, measuring 76" wide by 80" long, is large enough for a couple to sleep comfortably, even with a small child or pet. Extra firm mattresses are best for support, as the added stiffness allows for proper spine alignment. With most of the pressure on the bones, muscles are freed, allowing arteries and veins to relax and improving circulation. For stomach and back sleepers, extra firm mattresses can't be beat.

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  • iSeries Hybrid 100 13.5" Firm Mattress

    ONLY AT MATTRESS FIRM

    Serta iSeries Hybrid 100 13.5" Firm Mattress
    Serta iSeries Hybrid 100 13.5" Firm Mattress
    $767.36 - $1,151.36 $1,199.00 - $1,799.0 (up to 36% off)
     or as low as  $43.71/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
  • Perth 8" Innerspring Mattress

    WEB EXCLUSIVE

    Hampton and Rhodes Perth 8" Innerspring Mattress
    Hampton and Rhodes Perth 8" Innerspring Mattress
    $219.50 - $299.50 $439.00 - $599.0 (up to 50% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • Legend Garrison 14.7" Extra Firm Mattress
    Simmons Beautyrest Legend Garrison 14.7" Extra Firm Mattress
    Simmons Beautyrest Legend Garrison 14.7" Extra Firm Mattress
    $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
  • iComfort Blue Touch 300 11.25" Firm Mattress

    ONLY AT MATTRESS FIRM

    Serta iComfort Blue Touch 300 11.25" Firm Mattress
    Serta iComfort Blue Touch 300 11.25" Firm Mattress
    $1,149.00 - $1,999.00
     or as low as  $36.64/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
  • Semi Flex Foundation

    NEW AT MATTRESS FIRM

    Sleepy's Semi Flex Foundation
    Sleepy's Semi Flex Foundation
    $125.00 - $150.00