10 bestFirm King Size Mattresssof January 2026

Flo Polyurethane Ortho Mattress | Aloe Vera Infused Orthopedic Mattress With Pain Release Technology | Medium Firm Feel | 6 Inch Mattress In King Size (72X72X6 Inches) | 10 Year Warranty

The Sleep Company SmartGRID Orthopedic Pro - Doctor Recommended | Pressure Relieving | Scientifically Proven 5 Zone Support | 10 Inch King Size AIHA Certified Firm Mattress for Back Pain | 78x72

Wakefit Mattress | 10 Years Warranty | ErgoTech EcoLatex Classic Mattress, Mattress Double Bed, Natural Latex Mattress, 8-Inch Bed Mattress, Mattress King Size (75x70x8 Inches, Firm, 7-Zone)

The Sleep Company SmartGRID Ortho 5 Inch Mattress King Size | AIHA Certified Medium Firm Orthopedic Mattress for Back Pain Relief | Japanese SmartGRID Technology |72x72 | 10 Years Warranty | Grey

SleepyCat Latex Mattress|10 Years Warranty |Firm,Orthopedic 6-Inch Hybrid Mattress with Pinhole Tech Latex&Memory Foam Layers|5-Zone Support&Bamboo Cover(King Size,78X72X6Inches)

duroflex LiveIn Duropedic - Doctor Recommended Orthopaedic, Pressure Relieving, Memory Foam, Roll Pack, 6 Inch King Size Medium Firm Mattress with Luxury Anti Microbial Fabric (78 X 72 X 6 Inches)

LOOM & NEEDLES Reactive Dual Comfort Pocket Spring Mattress | 12 Inches 5 Zoned 7 Layered Orthopedic King Size Bed | Gel Memory & HD Techo Medium Firm Foam Gadda | 72x72 Inch

LOOM & NEEDLES Orthopedic Mattress | 5 Zone Cooling Gel Medium Firm Memory Foam Orthopaedic Mattresses | 8 Inches King Size Gadda with Temperature Control Technology | 75x72 Inch

Wakefit Mattress | 15 Year Warranty |Ortho Plus Mattress | King Mattress, 5-Inch King Size Mattress (72x70x5 Inches, Medium Firm, AeroTex Plus Luxury Fabric, Space Grey)