Shop Serta King Extra Firm Mattresses

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The Serta 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 optimal for support, as the added stiffness allows for excellent spine alignment. When pressure is on the bones, muscles are freed, improving circulation by allowing arteries and veins to relax. For stomach and back sleepers, extra firm mattresses are a dream.

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  • ONLY AT MATTRESS FIRM

    $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
  • ONLY AT MATTRESS FIRM

    $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