10 Best 4 Inch Mattress Topper Cal King of 2025

Tested and Reviewed: Top 10 4 Inch Mattress Topper Cal King deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

LUCID

LUCID 4 Inch Lavender Infused Memory Foam Mattress Topper - Ventilated Design - California King Size

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Editor's bottom line:

“This 4 inch mattress topper cal king is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

The 4-inch profile offers the highest degree of luxurious plushness, letting you sink into comfort and softness, perfect for a mattress thats decidedly too firm
A calming lavender scent is infused directly into the memory foam to promote a relaxing and soothing sleep environment
This topper features a ventilated design to provide a more breathable and cooler feel than traditional memory foam toppers
All three profiles have the same feel, but a thicker topper will result in a deeper sink that cradles your body more than a thinner topper
New foam scent is normal and will dissipate over the first 48 hours after opening; this product features a 3-year warranty

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Picked by 309 people today

9.5

ViscoSoft

ViscoSoft 4 Inch Memory Foam Mattress Topper Cal King - Select High Density Ventilated Mattress Pad - Premium Removable Rayon Cover

Main Highlights

Experience the ultimate in comfort, support, and value with the Select High Density mattress topper from Viscosoft. Crafted with superior memory foam that boasts a density of over 3 lbs (per cubic foot), this topper has been recognized for enhancing sleep quality and outlasting lighter-weight options. It delivers a medium-firm feel, making it ideal for those looking to elevate the support and comfort of their existing mattress.
This topper is excellent for those dealing with chronic pain as it has superior pressure point relief, provides spinal alignment, and increases circulation. Packed with innovative features, this mattress topper's blend of quality and value is available with two, three or four inches of high-density, memory foam.
Cool and Comfortable Sleep - Body temperature plays a crucial role in overall sleep comfort. Engineered with breathable, gel-infused memory foam, this topper draws heat away from the body and optimizes airflow, ensuring you stay cool throughout the night.
No Hassle Satisfaction - Proudly headquartered in Charlotte, NC, Viscosoft backs its premium toppers with a 60-Day No Hassle Money Back Guarantee, ensuring quality you can trust. If it doesn't meet your expectations, return it hassle-free for a full reimbursement.
Uniform Design - Each Select High Density topper is crafted from a single block of foam, ensuring consistent support and durability. Unlike other options that use concave designswhere foam is scooped out, creating dips that reduce overall support and stabilityour topper offers true craftsmanship and long-lasting comfort for all sleep positions. Some toppers are designed like this to make them look appealing but these methods compromise quality and under-perform for certain sleep styles.
Integrity to the Edge - The high-density foam offers unmatched edge support, making it easy to get in and out of bed without any sinking or instability. Unlike other toppers, our foam prevents that dreaded "dumped" feeling when sitting on the edge, ensuring consistent support across the entire mattress.
Reliable Comfort - Count on this topper to provide a consistently restful sleep experience for years to come. Whether you use it every night for the next five years or store it for several months, expect the foam to deliver the same quality sleep as the day it arrived. The resilient foam maintains a flat surface, preventing valleys, indentations, and compressions, so you can enjoy perfectly supportive sleep every night.
Clean, Secure Fit - The rayon cover features a stylish, slip-resistant bottom and adjustable elastic straps, providing a secure fit. These thoughtful features eliminate the need for constant adjustments that interrupt sleep and make your bed look messy. Plus, the cover is removable and machine-washable, allowing you to maintain a consistently clean sleep environment while adding a protective layer against dirt and dust. Best of all, the cover arrives already fitted to the foam.
Diverse Size Selection - As a leader in mattress toppers, Viscosoft offers products in a variety of sizes to enhance comfort in as many beds as possible. Along with options that perfectly fit all standard bed sizes, the Twin XL is ideal for college dorms and split king beds, the Queen Short is designed for RVs and campers, and the Full XL accommodates evolving campus needs and futons. This selection underscores our commitment to delivering a better way to great sleep to as many as possible.

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9.5

Sleep Lab

Sleep Lab Dual Layer 4 Inch Memory Foam Mattress Topper - Cal King Mattress Topper - Cooling Mattress Topper for Back Pain - 2 Inch Cooling Gel Memory Foam + 2 Inch Super Soft Bamboo Fabric Pillow Top

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Main Highlights

Luxurious Comfort and Quality Experience ultimate comfort with our dual-layer 4-inch topper, featuring a 2-inch gel memory foam and a 2-inch quilted pillow top. This california king size foam mattress topper provides luxurious softness and support. Designed with premium microfiber and high-quality materials, the soft mattress topper ensures durability. Enjoy the plush feel of our gel mattress topper king, whether you need a mattress topper california king for added comfort or extra cushioning.
Enhanced Sleep Quality Transform your sleep with our memory foam mattress topper 4 inch. Featuring slow rebound gel memory foam and an ergonomic design, it offers optimal support and comfort. Ideal as a feather mattress topper king, it ensures you wake up refreshed and rejuvenated. This pillowtop mattress topper is perfect for both sofa beds and regular beds, providing a cozy and supportive surface. Enhance your sleep with a mattress topper alternative down that adapts to your bodys contours.
Cool and Breathable with Bamboo Fabric Stay cool and comfortable all night with best pillowtop mattress topper and its breathable design. The soft surface and stress-relief features of best mattress topper for back pain help maintain a comfortable sleep, reducing tossing and turning. This mattress topper king size bed offers a cooler sleep environment. The highly breathable cool pillow top and super soft bamboo fabric provide a luxurious feel and enhance your sleep comfort.
Convenient and Eco-Friendly Enjoy the convenience of easy care with our eco-friendly memory foam mattress topper king. The machine washable pillow top makes maintenance a breeze. This california king mattress topper features high-quality materials for durability. The california king memory foam mattress topper ensures a comfortable sleep experience. Use the cal king mattress topper for added protection and comfort. Our king foam mattress topper offer versatility and ease of use.
Optimal Fit and Long-Term Warranty Our deep pocket design ensures the topper holds the mattress perfectly, providing adjustable comfort and a secure fit. The skin-friendly fiber-fill pillow top adds softness. This pillowtop mattress topper king offers unmatched support. Ideal for a cal king pillow top mattress topper bed, its one of the best hard mattress topper for back pain. The bed mattress topper enhances comfort, making it a great cali king mattress topper, backed by a 10-year warranty.

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9.2

EGOHOME

EGOHOME 5-Zone Memory Foam Mattress Topper 4 Inch Cal King, Cooling Gel Infused Foam Mattress Topper for Pressure Relief, CertiPUR-US Certified Bed Topper,Blue, 72"×84"

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Main Highlights

5-Zone Structure Design: The 5-zone configuration of the topper is designed with distinct sections, each tailored to deliver varying levels of support to specific areas of the body. This focused support aids in preserving proper spinal alignment and alleviating pressure on key areas, including the shoulders, hips, and lower back.
High-Quality Memory Foam: This premium memory foam is recognized for its exceptional comfort and long-lasting support. Its responsive nature molds to the body's shape, minimizing pressure points and isolating motion for a restful sleep experience.
Cooling Gel Integration: Mattress with gel-infused topper deliver an optimal balance of coolness and comfort, offering improved temperature control, pressure relief, and overall support.
Enhanced Air Circulation: The tiny channels on the mattress topper's surface facilitate better airflow, helping to reduce heat and moisture accumulation, ensuring a dry and comfortable sleeping environment.
Suitable for All Kinds of Uses: Gel-infused toppers are adaptable for various sleeping surfaces, such as traditional mattresses, futons, and RV beds. Available in a variety of thicknesses and sizes, they cater to diverse comfort preferences and requirements.

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9.0

LINSY LIVING

LINSY LIVING 4 Inch California King Mattress Topper, Gel Infused Swirl Memory Foam, Bed Topper Cali King Size, Cooling Mattress Pad, CertiPUR-US Certified, CK Size

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Main Highlights

Gel Infused Swirl Mattress Topper - Includes cooling gel beads to dissipate heat away faster and regulate your body temperature. We add swirl to make waves pattern, sleeping on it would feel like surfing, have a whole new experience this year!
High Density Memory Foam - Our mattress topper is made of 30D memory foam, it has 2 inches of supportive foam and 2 inches of gel memory foam, the slow rebounce feature of memory foam can make your bed softer and help to increase the comfort level of your bed
Take Your Sweet Dreams Back - Is your mattress old enough to make you feel the spring underneath? It is time to get a LINSY LIVING california king mattress topper, with it's soft and comfy, your sleep quality would be completely improve within affordable budget. Upgrade your bed does not need to buy a whole new mattress
CertiPUR-US Certified - LINSY LIVING memory foam mattress topper california king has passed the CertiPUR-US test, which means our mattress topper has passed strict tests and meet the standards for smell, material, performance and durability, a bed topper you can definitely trust
10-Year warranty - 30 days trial protects your rights as a consumer. We also provide a 10-year warranty for all of our customers, so if you have any questions or unsatisfied with the gel mattress topper, you can contact LINSY LIVING for support, we are 24/7 for you.

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8.8

LUCID

LUCID 4 Inch Gel Memory Foam Mattress Topper, Ventilated Design, Ultra Plush, CertiPUR-US Certified, California King , Blue

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Main Highlights

PLUSH MEMORY FOAM FEEL: Add 4 inches of thick, plush gel memory foam to your bed to create a soft and conforming feel that cradles your body while you sleep
COOLING GEL INFUSION: Contouring memory foam is infused with gel material that captures and dissipates heat for a cooler memory foam experience
DESIGNED FOR BREATHABILITY: This thick topper provides maximum comfort and softness without sacrificing breathability. A ventilated design improves airflow so you can sleep cool and comfortable
ELEVATED PRESSURE POINT RELIEF: Upgrade your old mattress with this memory foam topper that distributes weight evenly and conforms to your curves for targeted pressure point relief
SHIPS IN A BOX: Rolled and shipped in a box, this topper meets the highest safety standards; just open it and give it 24-48 hours to decompress and shed the new foam scent; 3-year warranty

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8.6

OLANLY

OLANLY Dual-Layer 4 Inch Cal King Size Memory Foam Mattress Topper for Back Pain, 2 Inch Cooling Pillow Top Mattress Pad Cover and 2 Inch Gel Memory Foam Topper, Deep Elastic Pocket, White

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Main Highlights

2 In 1 Adjustable and Convenient: 4-inch dual-layer memory foam cal king mattress topper combines a 2-inch quilted pillow top mattress topper with a 2-inch gel foam mattress topper to deliver the balance of softness and support. Choose the right one according to different scenarios and needs!
Improve Sleep and Relieve Pain: Cal king size mattress topper layer conforms to your bodys natural contours, alleviating pressure on the neck, shoulders, and back. It promotes proper spinal alignment, reducing discomfort and allowing for deep, restorative sleep.
Breathable and Soft: Premium 800gsm polyester microfiber filled cooling cal king size mattress pad. The pillow top mattress pad ensures a fluffy, luxurious feel while maintaining excellent breathbility, keeping you comfortable and fresh throughout the night.
Deep Pocket Fit for Secure Placement: Cal king mattress topper features a 360° elastic skirt that fits mattresses up to 21 inches deep. It stays firmly in place, ensuring consistent comfort without slipping or shifting, even with movement during the night.
Easy Care and Maintenance: Pillow top mattress topper cover is machine washable for effortless cleaning. Simply wash in cold water and tumble dry on low. Allow 48-72 hours for the memory foam layer to fully expand and air out before use, ensuring the best sleeping experience.

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8.3

Sleep Innovations

Sleep Innovations Dual Layer 4 Inch Memory Foam Mattress Topper, California King Size, Medium Support, 2 Inch Cooling Gel Memory Foam Plus 2 Inch Pillow Top Cover

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Main Highlights

Dual Layer California King Size Gel Memory Foam Mattress Topper: This luxurious 2 layer mattress topper features a 2 inch soft quilted pillow top cover with plush fiber fill and 2 inches of cooling gel memory foam for a medium feel
Bedtime Made Better: This gel foam mattress topper offers plush support for all sleep positions; The 2 inch pillow top cover is removable, washable, and stretches to fit your bed like a fitted sheet
Instantly Improve Any Mattress: Relieve pressure points, enjoy deeper sleep, and wake up feeling refreshed with our line of memory foam, gel memory foam, dual layer, and pillow top mattress toppers
Made In The USA: Our memory foam mattresses, mattress toppers, and pillows are all hypoallergenic and CertiPUR-US certified, offering you high quality materials for high quality sleep
Committed To Great Sleep: We invented the memory foam mattress in a box and we continue to innovate restorative foams and fabrics to give you the best night's sleep; This topper comes with a 10 year warranty

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8.1

CHUN YI

CHUN YI 4 Inch Memory Foam Mattress Topper King Size with Cooling Cover, Gel Infused Bed Topper, Ventilated Mattress Pad with Removable Washable Cover, CertiPUR-US Certified

Main Highlights

- Our 4 inch gel-infused memory foam mattress topper delivers luxurious comfort that transforms any bed into a sleep sanctuary. Designed to cradle your body, it eliminates pressure points for a blissful night's sleep.
& , - The cooling, breathable cover enhances air circulation, ensuring a cool, fresh and comfortable sleep environment. Its removable and washable design makes maintenance hassle-free.
- The innovative, smaller packaging of this foam mattress topper ensures convenient delivery right to your doorstep while reducing the carbon footprint.
- The upgraded straps can perfectly match your bed, and the breathable mesh bottom is non-slip. Secure all 4 straps and tighten the elastic bands to ensuring your mattress topper stays in place at night.
- - - Enjoy 90 days trial to test our mattress topper risk-free and rest assured knowing it's backed by a 10 years after-sales service for quality. Easy setup, expanding fully in 48-72 hours.
& - Rest easy on our queen mattress topper, which is OEKO-TEX and CertiPUR-US certified. Free from harmful chemicals and odors, it provides peace of mind regarding the quality, lifespan, and safety of your bed topper.

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Best Value

8.1

Save 10%

LINSY LIVING

LINSY LIVING Mattress Topper California King, 4 Inches Gel Memory Foam Mattress Topper, Removable & Washable Cover, Non-Slip Deisgn, CertiPUR-US Certified, California King Size

10% OffFree Shipping

Main Highlights

Memory Foam Mattress Topper - LINSY LIVING 4-inch mattress topper california king combines a 2-inch supportive gel memory foam and a further 2-inch of regular memory foam that contours to your body to improve your sleep quality.
Moderate Firmness - Our high-density california king size memory foam mattress topper is supportive and comfortable, gradually fitting the curve of your body to hug you as you drift off to sleep. The mattress topper is slightly firm to relieve back pain and pressure.
Removable and Washable Cover The zippered gel mattress topper california king has a machine washable cover, making it super convenient for you to remove and clean the outer cover, prolonging the life of your topper. (NOTE: the inner memory foam is not washable).
Anti-Slip Design - The slip-resistant design keeps the cali king foam mattress topper in place, and the elastic straps hold the topper firmly to the mattress. You do not need to rotate or adjust the position of this california king mattress topper.
Certified product - LINSY LIVING cal king mattress topper is certified by CertiPUR-US and OEKO-TEX to ensure the product emits no toxic or harmful chemicals.
*After unpackaging, please allow the bed topper full 48-72 hours to expand fully.

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Our Best Overall Choice

Best Choice

9.7

LUCID

LUCID 4 Inch Lavender Infused Memory Foam Mattress Topper - Ventilated Design - California King Size

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

The 4-inch profile offers the highest degree of luxurious plushness, letting you sink into comfort and softness, perfect for a mattress thats decidedly too firm
A calming lavender scent is infused directly into the memory foam to promote a relaxing and soothing sleep environment
This topper features a ventilated design to provide a more breathable and cooler feel than traditional memory foam toppers
All three profiles have the same feel, but a thicker topper will result in a deeper sink that cradles your body more than a thinner topper
New foam scent is normal and will dissipate over the first 48 hours after opening; this product features a 3-year warranty

Show Price

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