Shop Serta King Firm Mattresses

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A Serta firm king mattress, measuring 76" by 80", is a great mattress for sleepers who want more room to sleep without losing support. Especially created for sleepers seeking extra space, a Serta king firm mattress gives you extra room while ensuring your body is properly supported. With a Serta firm king size mattress, you'll sleep like a king.

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  • 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