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10 Best firm mattress in a box kings of 2025
Explore up to 41% off
Best Choice1
Clicked 18 times in the last monthDIFAMEDIFAME King Size Mattress 14 Inch, Gel Memory Foam Hybrid Firm King Bed Mattress in a Box with Independent Pocket Spring, Pressure & Back Pain Relief, Edge Support, 100-Night Trial, CertiPUR-US
9.8Exceptional
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Value for Money2
RuoysunRuoysun King Size Mattress, 12 inch Hybrid Mattresses in a Box, Firm King Mattress with Gel Memory Foam and Pocket Springs, Pressure Relief & Upgraded Support, Cooling and Breathable
9.7Exceptional
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3
AyeawoAyeawo Firm King Size Mattress, 12 Inch Hybrid Mattress King Size with Gel Memory Foam and Pocket Springs, Premier Comfort King Bed Mattress in a Box, Breathable and Pressure Relief, CertiPUR-US
40% Off9.4Excellent
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4
ZinusZINUS 12 Inch Green Tea Memory Foam Mattress [New Version], King, Fiberglass free, Medium Firm Feel, Zoned Pressure Relief, Certified Safe Foams & Fabric, Mattress in A Box
9.3Excellent
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5
NovillaNovilla King Mattress, 12 Inch Hybrid Mattress in a Box, High Density Base Foam with Pocket Coils for a Cozy Sleep, Pain Relief, Medium Firm King Size Mattress, Pillow Top Mattress, Motion Isolation
40% Off9.2Excellent
Our Rating
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6
SUAYEASUAYEA King Size Mattress, 12 Inch King Mattress in a Box, Medium Firm Pocket Spring and Gel Memory Foam for Superior Comfort, Pressure Relief, Strong Edge Support
41% Off9.1Excellent
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7
LETMOONLETMOON Firm King Size Mattress, 12 Inch Gel Memory Foam Hybrid Mattress King Bed in a Box, Pressure & Pain Relief, Individual Pocket Spring, Edge Support, CertiPUR-US
31% Off9.0Excellent
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8
DIFAMEDIFAME King Size Mattress, 14 Inch Gel Memory Foam Hybrid Firm King Bed Mattress in a Box, Pressure & Back Pain Relief, Individually Pocket Spring, Edge Support, 100-Night Trial, CertiPUR-US
8.9Very Good
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9
SoulfeaSoulfea King Size 14 Inch Memory Foam Hybrid Black King Mattress, Pocket Spring Mattress in a Box, Medium Firm, with Provide Support and Improve Sleep Mattresses
21% Off8.6Very Good
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10
SUAYEASUAYEA King Size Mattress, 12 Inch King Mattress in a Box, Medium Firm Pocket Spring and Gel Memory Foam for Superior Comfort, Pressure Relief, Strong Edge Support
20% Off8.5Good
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