Firm King Size Mattresses

Mattresses Sale Ends October 22nd

Showing 1-36 of 239 results

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  1. King Simmons Beautyrest Silver Kenosha Place III Luxury Firm Mattress
    Free Delivery
    King Simmons Beautyrest Silver Kenosha Place III Luxury Firm Mattress
    Rating:
    94%

    From $739.00

    To $3,807.00

    Reg: $869.00 You save $130.00!
    Comfort Scale - 3.5
  2. King Simmons Beautyrest Silver Kenosha Place III Extra Firm Mattress
    Free Delivery
    King Simmons Beautyrest Silver Kenosha Place III Extra Firm Mattress
    Rating:
    92%

    From $739.00

    To $3,807.00

    Reg: $869.00 You save $130.00!
    Comfort Scale - 1.5
  3. King Simmons Beautyrest Black Natasha Luxury Firm Pillow Top Mattress + FREE $300 Gift Card
    Free Express Delivery
    King Simmons Beautyrest Black Natasha Luxury Firm Pillow Top Mattress + FREE $300 Gift Card
    Rating:
    80%
    (2)

    From $3,299.00

    To $6,367.00

    Reg: $3,499.00 You save $200.00!
    Comfort Scale - 5
  4. King Simmons Beautyrest Black Desiree Luxury Firm Mattress + FREE $300 Gift Card
    Free In Home Set Up!
    King Simmons Beautyrest Black Desiree Luxury Firm Mattress + FREE $300 Gift Card
    Rating:
    100%
    (4)

    From $2,399.00

    To $5,467.00

    Reg: $2,599.00 You save $200.00!
    Comfort Scale - 3
  5. King Simmons Beautyrest Silver Kenosha Place III Luxury Firm Pillow Top Mattress
    Free Delivery
    King Simmons Beautyrest Silver Kenosha Place III Luxury Firm Pillow Top Mattress
    Rating:
    90%

    From $819.00

    To $3,887.00

    Reg: $969.00 You save $150.00!
    Comfort Scale - 4
  6. King Simmons Beautyrest Black Katarina Luxury Firm Pillow Top Mattress + FREE $300 Gift Card
    Free Express Delivery
    King Simmons Beautyrest Black Katarina Luxury Firm Pillow Top Mattress + FREE $300 Gift Card
    Rating:
    96%
    (4)

    From $2,699.00

    To $5,767.00

    Reg: $2,899.00 You save $200.00!
    Comfort Scale - 4.5
  7. King Simmons Beautyrest Black Calista Extra Firm Mattress + FREE $300 Gift Card
    Free Express Delivery
    King Simmons Beautyrest Black Calista Extra Firm Mattress + FREE $300 Gift Card
    Rating:
    96%
    (9)

    From $2,099.00

    To $5,167.00

    Reg: $2,299.00 You save $200.00!
    Comfort Scale - 2
  8. King Simmons Beautyrest Platinum Tillingham III Luxury Firm Mattress
    Free Sleeptracker!
    King Simmons Beautyrest Platinum Tillingham III Luxury Firm Mattress
    Rating:
    94%

    From $1,429.00

    To $4,497.00

    Reg: $1,679.00 You save $250.00!
    Comfort Scale - 3
  9. King Simmons Beautyrest Black Mariela Luxury Firm Mattress + FREE $300 Gift Card
    Free Express Delivery
    King Simmons Beautyrest Black Mariela Luxury Firm Mattress + FREE $300 Gift Card
    Rating:
    100%
    (1)

    From $3,099.00

    To $6,167.00

    Reg: $3,299.00 You save $200.00!
    Comfort Scale - 3
  10. King Sealy Posturepedic Response Premium Warrenville IV Cushion Firm Mattress
    Free In Home Delivery
    King Sealy Posturepedic Response Premium Warrenville IV Cushion Firm Mattress
    Rating:
    76%

    From $939.00

    To $4,806.00

    Reg: $1,179.00 You save $240.00!
    Comfort Scale - 3
  11. King Sealy Posturepedic Response Premium Warrenville IV Cushion Firm Pillow Top Mattress
    Free In Home Delivery
    King Sealy Posturepedic Response Premium Warrenville IV Cushion Firm Pillow Top Mattress
    Rating:
    96%

    From $939.00

    To $4,806.00

    Reg: $1,179.00 You save $240.00!
    Comfort Scale - 4.5
  12. King Simmons Beautyrest Black Mariela Extra Firm Mattress + FREE $300 Gift Card
    Free Express Delivery
    King Simmons Beautyrest Black Mariela Extra Firm Mattress + FREE $300 Gift Card
    Rating:
    100%
    (1)

    From $3,099.00

    To $6,167.00

    Reg: $3,299.00 You save $200.00!
    Comfort Scale - 2.5
  13. King Simmons Beautyrest Silver Hybrid Sondra III Luxury Firm Mattress
    Free Sleeptracker!
    King Simmons Beautyrest Silver Hybrid Sondra III Luxury Firm Mattress
    Rating:
    86%
    (4)

    From $839.00

    To $3,907.00

    Reg: $1,499.00 You save $660.00!
    Comfort Scale - 3.5

Showing 1-36 of 239 results

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Firm King Size Mattresses



The King is the largest of the standard mattress sizes, providing couples with spacious comfort even when sharing the bed. Firm King size mattresses are designed for couples where both sleepers enjoy a medium-firm to hard level of comfort, or where one or both sleepers need solid support to avoid waking up with a sore back. Side sleepers generally do not do well on firm mattresses, as the dense sleeping surface is too unforgiving for the outlying hips and shoulders. But if you and/or your partner enjoys/needs a firm sleeping surface, you won't beat the spacious luxury of a King.

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