King-Size Extra Firm Mattresses

An extra firm king mattress, measuring 76" by 80", is perfect for sleepers who like extra real estate to stretch in their sleep but don't want to sacrifice support. First debuted in 1958 by Simmons, the king size mattress was created as a solution for the increasing number of tall sleepers who struggled to fit on the standard full size mattress of the day. With an extra firm mattress, you have enough room and support to finally rest easy.

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  • $49.00 - $69.00
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