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10 Best firm mattress kings of 2026
Save up to 43% off
1
SleepmaxSleepmax Mattress King Size 12 Inch - Hotel-Collection Hybrid Mattress Extra Lumbar & Hips Support - Pain Relief Deep Sleep Bed in a Box - 365-Night Trial, Fiberglass-Free, CertiPUR-US Certified
9.6Exceptional
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2
MLILYEGOHOME 14 Inch King Size Memory Foam Mattress for Back Pain, Cooling Copper Gel Bed in a Box, Foam Made in USA, CertiPUR-US Certified, Therapeutic Medium Firm, 76x80x14 Black
14% OffKey specs-
size:King
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construction:High density base foam
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fill material:Memory foam
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dimensions:80 x 76 x 14 inches
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top style:Cooper gel aerofuion
9.5Excellent
Our Rating
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3
SLEEP100SLEEP100 King Mattress, 14 Inch 5-Zone Deep Sleep Firm Mattress with Extra Lumbar & Shoulder Support, Hotel Collection Hybrid Mattresses, Fiberglass Free & No Odor - 365 Nights Trial
10% Off9.4Excellent
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4
BedStoryBedStory Firm King Mattress 14 Inch - Deep Sleep Hybrid Mattresses 7-Zone Pain Relief - Firm Bed in a Box - Fiberglass Free, CertiPUR-US Certified, 365-Night Trial,10 Years Warranty
9.3Excellent
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5
RRESTARRESTA Firm King Mattress 14 Inch - Hotel Collection Hybrid Mattress with 7-Zone Support for Spinal Alignment & Back Pain Relief, 395-Night Trial, CertiPUR-US & Fiberglass-Free
43% Off9.1Excellent
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6
BedStoryBedStory Extra Firm King Mattress 14 Inch, Hotel Collection Hybrid Mattresses with Zoned Lumbar Support, Extra Back & Hip Support, CertiPUR-US, Fiberglass-Free, 365-Night Trial
25% Off8.9Very Good
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7
ZinusZinus 12 Inch King Green Tea Memory Foam Mattress [New Version], Fiberglass Free, Medium Firm Feel, Zoned Pressure Relief, Certified Safe Foams & Fabric, Mattress in A Box
Key specs-
size:King
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construction:Zoned pressure relief
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fill material:Memory Foam
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dimensions:80 x 76 x 12 inches
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top style:N/A
8.8Very Good
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8
NovillaNovilla King Size Mattress, 12 Inch Gel Memory Foam King Mattress for Cool Night & Pressure Relief, Medium Plush Feel with Motion Isolating, Bliss
Key specs-
size:King
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construction:4-layer all-foam system
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fill material:Memory foam
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dimensions:80 x 76 x 12 inches
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top style:Gel-infused memory foam
8.7Very Good
Our Rating
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9
AyeawoAyeawo Firm King Size Hybrid Mattress 12 Inch, Bed in a Box with Pocket Spring, Gel Memory Foam, Pressure Relief & Lumbar Support, Cooling Feel, CertiPUR-US Certified, 365 Night Trial
16% Off8.6Very Good
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10
UniPonUniPon Extra Firm King Size Mattress, 14 inch Hybrid Mattress with Extra Back and Lumbar Hip Support, Fiberglass Free, 365 Nights Trial & 10 Years Warranty
8.5Good
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