medium-firm king mattress best sellers

#1 12 Inch Green Tea Cooling ZINUS 12 Inch Green Tea Cooling Memory Foam Mattress [New Version], King, Fiberglass Free, Medium Firmness, Cooling Gel Foam, Certified Safe Foams & Fabric, Mattress in A Box

$338 on Amazon

#2 King Mattress Famistar King Mattress, Famistar 14 Inch Memory Foam Mattress King Size, Innerspring Hybrid King Bed Mattress in a Box Medium Firm with Motion Isolation & Strong Support & Pressure Relief, CertiPUR-US

$269.99 on Walmart

#3 12 Inch Green Tea Memory ZINUS 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

$344.99 on Amazon

#4 10 Inch Green Tea Cooling ZINUS 10 Inch Green Tea Cooling Memory Foam Mattress [New Version], King, Fiberglass Free, Medium Firmness, Cooling Gel Foam, Certified Safe Foams & Fabric, Mattress in A Box

$355 on Amazon

#5 King Size Mattress Famistar King Size Mattress, Famistar 13 Inch Memory Foam Mattress in a Box, Individual Innerspring hybrid King Bed Mattress, Medium Firm, CertiPUR-US Certified

$289.99 on Walmart

#6 Premier Copper 14" King Nectar Premier Copper 14" King Mattress - Medium Firm Gel Memory Foam Mattress - 5 Layers of Comfort - Triple Action Cooling Tech - 365-Night Trial - Forever Warranty,White

$1125 on Amazon

#7 NapQueen Victoria 10" NapQueen Victoria 10" Medium Firm, Hybrid of Cooling Gel Infused Memory Foam and Pocket Spring Mattress, King Size

$138 on Walmart

#8 Cooling Gel Memory Foam Amazon Basics Cooling Gel Memory Foam Mattress, Medium-Firm, CertiPUR-US Certified, 12 inch, King Size, White/Gray

$342.89 on Amazon

#9 Crystli 12" Hybrid King Crystli 12" Hybrid King Mattress Memory Foam Mattress with Wrapped Innersprings Medium Firm Bed-in-a-Box CertiPUR-US Certified King Mattresses

$139.99 on Walmart

#10 King Mattress 12 Inch LMANKBK King Mattress, 12 Inch Innerspring Hybrid Mattress in a Box with Gel Memory Foam, Individually Wrapped Encased Coil Pocket Spring Mattress, Pressure Relief, Medium Firm Support, 76"*80"*12"

$259.99 on Amazon

#11 King Size Mattress 12 LETMOON King Size Mattress, 12 Inch Hybrid King Mattress, 3 Coils Strong Edge Support, Medium Firm Mattress with Memory Foam and Pocket Springs, Pressure Relief

$259.95 on Amazon

#12 SUI LONG 12 Inch King SUI LONG 12 Inch King Mattress, Spring and Memory Foam Hybrid Mattress, Mattress in a Box, Medium Firm

$251 on Walmart

#13 King Size Mattress 14 Molblly King Size Mattress, 14 Inch Premium Cooling-Gel Memory Foam Mattress Bed in a Box, Cool King Bed Supportive & Pressure Relief with Breathable Soft Fabric Cover,Medium Firm

$279 on Amazon

#14 King Mattress Nisien King Mattress,Nisien 12 Inch Hybrid Mattress in a Box, Gel Foam Mattress, Individually Wrapped Pocket Coils Innerspring Mattress, Support & Pressure Relief, Medium Firm Feel, 76"*80"*12"

$265.99 on Walmart

#15 YRLLENSDAN 5 Inch Gel YRLLENSDAN 5 Inch Gel Memory Foam Mattress Medium Firm Mattresses Bed-in-a-Box, King

$87.99 on Walmart

#16 King Mattress 14 Inch Rimensy King Mattress, 14 Inch Hybrid Mattress in a Box, Gel Foam Mattress, Individually Wrapped Pocket Coils Innerspring Mattress, Support & Pressure Relief, Medium Firm Feel, 76"*80"*14"

$305.99 on Amazon

#17 California King size California King size Mattress - 12 Inch Comfort Foam & Spring Hybrid Mattress - Euro Top - Medium Firm - Oliver & Smith

$99.99 on Walmart

#18 NISIEN Hybrid King Mattress NISIEN Hybrid King Mattress 12 Inch, King Size Spring Gel Memory Foam Mattress, Medium Firm King Mattresses in a Box

$259.99 on Walmart

#19 King Size Mattress 14 KOANTTI King Size Mattress,14 Inch Memory Foam Hybrid White King Mattresses,Pocket Spring King Mattress in a Box for Sleep Supportive Pressure Relief,Medium Firm Mattress.

$425.99 on Amazon

#20 Sweetnight 12 inch Gel Sweetnight 12 inch Gel Memory Foam Hybrid Mattress with Medium Firm Pillow Top, King Mattresses

$278 on Walmart