Best King Cool Gel Memory Foam Mattress: Top Picks Compared

A king cool gel memory foam mattress can give you a roomy sleep surface with cushioning that contours to your body. Gel-infused foam and breathable covers may help manage heat, but they cannot guarantee a cool night: your room, bedding, and personal comfort all matter. The options below range from plush 14-inch designs to more streamlined 12-inch models, so compare feel, construction, certifications, and setup needs before choosing.

Our top pick is the 14-inch COOL GEL Chill for its substantial profile, included pillows, and stated fiberglass-free construction. The other picks offer different trade-offs, including a cool-touch cover, a medium-firm feel, or a thinner profile. Check the size selector on each listing before ordering; not every supplied product title clearly identifies a King size.

Quick Comparison

Our Picks: Best King Cool Gel Memory Foam Mattress reviews

COOL GEL Chill: A Plush, Substantial 14-Inch Pick

The COOL GEL Chill is a 14-inch memory foam mattress made for shoppers who want a thicker, more cushioned bed. Its description highlights multiple layers of cooling gel memory foam, body contouring, and motion isolation. Two pillows are included, which may be useful when furnishing a bedroom, though the supplied details do not specify their fill or dimensions.

This model is a strong fit if you like the close, pressure-relieving feel associated with memory foam and want more cushioning around areas such as the shoulders and hips. Its foam is CertiPUR-US certified, and the product description specifies a fiberglass-free fire barrier. It is made in the USA and designed for platform beds, slatted frames, box springs, and adjustable bases.

The 14-inch height can mean deeper sheets are needed, and the mattress arrives compressed. The manufacturer recommends allowing up to 72 hours for full expansion. Gel foam may help with heat management, but it is not a promise that every sleeper will stay cool. Compared with the 12-inch picks, this is the more substantial option; compared with the Novilla Bliss, it does not list a cool-touch cover or a stated sleep trial in the supplied details.

Pros:

• Thick 14-inch profile with a plush, contouring design
• Multiple layers of cooling gel memory foam
• CertiPUR-US certified foam and a stated fiberglass-free fire barrier
• Includes two pillows and works with several common bed bases

Cons:

• The thicker profile may require deep-pocket sheets
• Full expansion can take up to 72 hours

Verdict: Choose the COOL GEL Chill if you want a plush, taller mattress with stated fiberglass-free construction and included pillows.

Best Price Mattress: A Medium-Firm 12-Inch Alternative

This 12-inch mattress combines gel-infused memory foam with a medium-firm feel. The brand describes the foam as contouring to the body while easing pressure, with a breathable design intended to support airflow. Its more moderate profile may suit shoppers who do not want the height of a 14-inch bed.

The supplied product title does not specify a King size, so confirm the size option on the listing before buying. The description also does not provide a detailed layer breakdown, a named foam certification, or a warranty term. That makes it harder to compare its construction and long-term coverage with the Novilla and ZINUS options.

Like the other boxed mattresses here, it arrives compressed and is described as expanding within 72 hours. Its medium-firm feel may appeal if you prefer a balance of cushioning and support rather than a very plush surface. However, firmness is subjective, and the product details do not identify a separate firmness choice.

Pros:

• Medium-firm design balances cushioning and support
• Gel-infused foam is intended to help regulate temperature
• 12-inch profile is shorter than the 14-inch options
• Compressed packaging is designed for convenient setup

Cons:

• The supplied title does not confirm King size, so check the listing carefully
• The provided details do not specify a warranty or named foam certification

Verdict: Consider this model if its medium-firm feel and 12-inch profile match your needs, but verify King availability and the listing’s coverage details first.

Novilla Bliss: A King Mattress with a Cool-Touch Cover

The Novilla Bliss is a 14-inch King memory foam mattress with a three-layer foam system. Its standout detail is the cool-touch nylon cover, blended with plant-infused fiber, paired with NanoGEL memory foam. The construction also includes cushioning foam and high-density support foam, which the brand says are designed to support alignment and limit excessive sinking.

This could suit hot sleepers who want a cooling-focused surface as well as shoppers who value a defined layer design. The brand also describes reinforced edges and motion isolation, features that may be useful for couples who share a bed. Its foam is CertiPUR-US certified, its fabric is OEKO-TEX certified, and the supplied product details state a 100-night trial and 10-year protection.

The cool-touch cover may feel refreshing at first, but a cool surface does not ensure that the whole mattress will feel cool all night for every person. This is also a taller mattress than the 12-inch Novilla, so check your sheet depth and bed-frame setup. Compared with the COOL GEL Chill, it lists more specific cover and trial details; the COOL GEL listing, in turn, explicitly states a fiberglass-free fire barrier.

Pros:

• 14-inch King profile with a cool-touch nylon cover
• Three-layer foam design with NanoGEL and high-density support foam
• CertiPUR-US foam and OEKO-TEX certified fabric
• Supplied details state a 100-night trial and 10-year protection

Cons:

• The taller profile may call for deeper sheets
• Cooling results can vary by sleeper and sleep environment

Verdict: Pick the Novilla Bliss if you want a King-size 14-inch mattress with a cool-touch cover and clearly stated certification and trial details.

Novilla 12-Inch King: A Lower-Profile Gel Foam Design

This Novilla is a 12-inch King mattress built with three foam layers. Its description calls out NanoGel-infused foam, a breathable knitted cover, and high-density foam intended to provide balanced support. The brand also describes the layers as helping absorb noise and movement, which may matter if you share your bed.

At 12 inches, this model has a lower profile than the 14-inch mattresses in this list. It may be a practical choice if you want gel memory foam without as much mattress height. The supplied details say the foam is CertiPUR-US certified and the cover is OEKO-TEX Standard 100 certified; they also state a 10-year protection period.

The listing recommends allowing 72 hours for the mattress to air out and reshape after unboxing. As with other gel foam options, the cooling language describes the design, not a guaranteed temperature outcome. Compared with the Novilla Bliss, this mattress has a shorter profile and a knitted cover rather than a stated cool-touch nylon cover.

Pros:

• King size with a more moderate 12-inch profile
• Three-layer design with gel memory foam and high-density support foam
• CertiPUR-US foam and OEKO-TEX certified cover
• Supplied details state a 10-year protection period

Cons:

• The setup instructions recommend up to 72 hours to air out and reshape
• It does not list the cool-touch cover featured on the Novilla Bliss

Verdict: Choose this Novilla if you want a King-size gel foam mattress with a 12-inch profile and stated foam and fabric certifications.

ZINUS Green Tea: A 12-Inch Gel and Green Tea Foam Mattress

The ZINUS Green Tea is a 12-inch foam mattress with three layers: 2 inches of gel and green tea-infused memory foam, 3 inches of comfort foam, and 7 inches of high-density base support foam. The brand describes the design as pressure-relieving and cooling, and identifies side sleepers and average-weight sleepers as a target fit.

Its stated layer measurements make the construction easier to compare with the other options. The foam is CertiPUR-US certified, and the supplied details include a 10-year limited warranty. The listing says the mattress is compressed for delivery and may take 24 to 72 hours to regain its full shape, with warmer rooms helping it expand faster.

The supplied title does not name a specific size, so confirm that a King option is selected before ordering. The product details state a maximum weight of 250 pounds for Twin and 500 pounds for other sizes; check the listing to confirm the limit that applies to your selected size. Compared with the two Novilla options, the ZINUS emphasizes green tea-infused foam and provides a precise layer breakdown, but it does not specify a cool-touch cover.

Pros:

• Detailed three-layer construction with a 7-inch support base
• Gel and green tea-infused memory foam
• CertiPUR-US certified foam
• Supplied details state a 10-year limited warranty

Cons:

• The supplied title does not confirm King size, so check the selected option
• The 24-to-72-hour expansion window can vary with room temperature

Verdict: Consider the ZINUS if you want a 12-inch mattress with a clearly described foam-layer layout, but verify the King option and applicable weight limit before purchase.

How to Choose a King Cool Gel Memory Foam Mattress

Confirm the King size before ordering

Some supplied product titles clearly name a King size, while others do not. Check the size selector and product details before placing an order, especially for the Best Price Mattress and ZINUS models. Confirming the selected size also helps you match the mattress to your bed frame and sheets.

Choose a profile that works with your bed

The options here are 12 or 14 inches tall. A thicker mattress can feel more substantial and may need deeper-pocket sheets. A 12-inch mattress may be easier to fit with existing bedding, but the right height depends on your frame, your preferred bed height, and how easy you want it to be to get in and out of bed.

Think about feel and support

Memory foam contours around the body, but firmness and comfort are personal. The Best Price Mattress is described as medium-firm, while the COOL GEL Chill is described as plush. The other listings focus on support layers and pressure relief without giving a clear firmness rating in the supplied details. If you can, compare the product’s comfort description with the feel you already know you prefer.

Set realistic expectations for cooling

Gel-infused foam is designed to help manage heat, and the Novilla Bliss adds a cool-touch nylon cover. These features can be useful, but they do not guarantee that a mattress will feel cool to every sleeper. Consider your room temperature, pajamas, sheets, and blankets as part of your sleep setup, too.

Compare materials and certifications

Certifications and material details differ among these mattresses. The supplied listings identify CertiPUR-US certified foam for the COOL GEL Chill, both Novilla models, and the ZINUS. The Novilla models also specify OEKO-TEX certified covers, while the COOL GEL Chill states that it has a fiberglass-free fire barrier. Look at the individual listing for the exact information that matters to you.

Check the frame, setup, and expansion guidance

Boxed foam mattresses arrive compressed and need time to expand. The listed guidance ranges from 24 to 72 hours, depending on the product. The COOL GEL Chill names platform beds, slatted frames, box springs, and adjustable bases as compatible; the Novilla 12-inch listing says it fits different kinds of King bed frames. Confirm frame compatibility and allow room for the mattress to expand after unboxing.

Read the current trial and warranty terms

Coverage varies by product, and the supplied details do not state terms for every mattress. The Novilla Bliss lists a 100-night trial and 10-year protection; the 12-inch Novilla lists 10-year protection; and ZINUS lists a 10-year limited warranty. Check each listing for the full terms, conditions, and any return requirements before buying.

Frequently Asked Questions

Does gel memory foam guarantee a cooler night?

No. Gel-infused foam and cooling covers are designed to help manage heat, but how cool a bed feels varies from person to person and depends on the room and bedding, too.

How long should a boxed foam mattress take to expand?

It depends on the model. The supplied information recommends up to 72 hours for the COOL GEL Chill and Novilla 12-inch mattress. ZINUS says its mattress may take 24 to 72 hours, and the Best Price Mattress is described as expanding within 72 hours.

Which option has a cool-touch cover?

The Novilla Bliss 14-inch King mattress lists a cool-touch nylon cover blended with plant-infused fiber. The other supplied descriptions highlight gel foam or breathable fabrics but do not specify the same type of cool-touch cover.

Which mattress is the thickest?

The COOL GEL Chill and Novilla Bliss are both 14 inches tall. The other listed models have a 12-inch profile.

Are these mattresses suitable for adjustable bases?

The COOL GEL Chill is specifically described as compatible with adjustable bases. For the other models, check the product listing or contact the seller to confirm compatibility with your particular base.

Which mattresses include stated certifications?

The supplied details identify CertiPUR-US certified foam for the COOL GEL Chill, both Novilla mattresses, and the ZINUS. The Novilla models also identify OEKO-TEX certified fabric or covers. Check the product page for the certification details that apply to the version you select.

Final Recommendation

For a plush, substantial mattress with a stated fiberglass-free fire barrier, included pillows, and CertiPUR-US certified foam, the COOL GEL Chill is the strongest all-around pick in this group. Choose the Novilla Bliss if you prioritize a cool-touch cover and clearly stated trial details, or the 12-inch Novilla if you prefer a lower profile. Before buying any model, confirm the King size, frame fit, and current terms on its product listing.