Shop Medium King Memory Foam Mattresses

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Not too soft, not too firm, a medium mattress is just right for a lot of sleepers. If you're searching for a medium mattress that will give you both space and exacting cushioning, a king size medium memory foam mattress is an ideal place to start. Our wide variety of king size memory foam mattresses includes everything from medium plush to medium firm options, so you can find the medium mattress that feels right for you. And at 76" x 80", a king mattress ensures you enjoy a wealth of space, whichever option you choose.

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  • WEB EXCLUSIVE

    $149.50 - $299.50 $299.00 - $599.0 (up to 50% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • NEW AT MATTRESS FIRM

    $159.20 - $239.20 $199.00 - $299.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • $319.20 - $479.20 $399.00 - $599.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

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

    $287.20 - $487.20 $359.00 - $609.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

    $327.20 - $567.20 $409.00 - $709.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

    $263.20 - $431.20 $329.00 - $539.0 (up to 20% off)
    EXTRA FIRM FIRM MEDIUM PLUSH ULTRA PLUSH
  • WEB EXCLUSIVE

    $287.20 - $487.20 $359.00 - $609.0 (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

    $659.00 - $1,599.00
     or as low as  $44.42/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

    $2,079.20 - $2,799.20 $2,599.00 - $3,499.0 (up to 20% off)
     or as low as  $43.32/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

    $3,039.20 - $3,759.20 $3,799.00 - $4,699.0 (up to 20% off)
     or as low as  $50.65/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