10 Best 4 Inch Memory Foam Mattress Topper California King of 2025
Last updated on 09/09/2025
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Best Choice
1
Bedlore 4-Inch California King Mattress Topper for Back Pain - Dual Layer Medium Support (2" Gel Memory Foam + 2" Cooling Fluffy Pillow Top Pad), Breathable & Pressure Relief (Gray)
BEDLORE
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BEDLORE
Bedlore 4-Inch California King Mattress Topper for Back Pain - Dual Layer Medium Support (2" Gel Memory Foam + 2" Cooling Fluffy Pillow Top Pad), Breathable & Pressure Relief (Gray)
12% OffFree Shipping
Why We Love It
- Dual-layer design for ultimate comfort.
- Pain relief for better sleep.
- Breathable fabric keeps you cool.
Main Highlights
- Dual Layer Design: The california king mattress topper features a 4-inch dual-layer design, combining 2-inch of gel-infused memory foam and a 2-inch pillow top
- Relieve Pain - Support: The cal king mattress topper conforms to the curve and shape of your body, helping distribute weight evenly and reduce pain in the hips, back & neck
- Stay Cool All Night: Made with breathable viscose derived from bamboo fabric, the cali king mattress topper keeps comfortably cool all night
- Deep Pocket Design: The elastic deep pocket fits mattresses up to 18" and ensure a secure fit even during restless nights
- Vacuum Package: Please leave it in a well-ventilated place for 24-72h to allow the smell of foam to dissipate and restore the fluffiness of the topper
Value for Money
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ViscoSoft 4 Inch Pillow Top Memory Foam Mattress Topper California King - Cooling Hybrid Lux Dual Layer Mattress Bed Pad - CertiPur-US Certified
ViscoSoft
20% Off
ViscoSoft
ViscoSoft 4 Inch Pillow Top Memory Foam Mattress Topper California King - Cooling Hybrid Lux Dual Layer Mattress Bed Pad - CertiPur-US Certified
20% Off
Why We Love It
- Luxurious sleep solutions for everyone.
- Eco-friendly recycled materials used.
- Customizable thickness for personalized comfort.
Main Highlights
- The Leading Name in Mattress Toppers: Viscosoft is consistently recognized for the highest quality memory foam and innovative fabrics, offering luxurious sleep solutions for every budget.
- A Better Way to Great Sleep: The thoughtful construction of this hybrid mattress topper immediately enhances the comfort of your bed by combining gel-infused memory foam for a cooler, more comfortable sleep surface with a beautiful, pillow-top cover that will make you think twice about covering it with sheets.
- Better Than Cotton: Tencel. A Tencel fiber cover delivers a significant upgrade over ordinary cotton, offering superior breathability, moisture-wicking, and silky softness. Tencel naturally regulates temperature, keeping you cool and comfortable throughout the night, while also being gentle on skin.
- Sleep with a Purpose: Our hybrid mattress topper stands out with ultra-plush fill in the cover made from over five pounds of recycled ocean plastic, merging eco-friendly practices with remarkable comfort.
- Quick & Easy Set-up: The foam and pillowtop cover come in a single box, manageable for one person. Simply unroll the foam on your bed, anchor the pillowtop cover to the foam with the four corner straps, and secure your to mattress with the elastic skirt.
- Two Options for Personalized Comfort: This hybrid topper comes in two thickness options for a customized upgrade to your sleep. A 3-inch option adds a plush, comfortable feel to your mattress with balanced memory foam and pillowtop cover layers. The 4-inch option includes an additional inch of foam for enhanced support and pressure relief making it a better choice for those with a mattress that is too firm or who desire a more substantial comfort upgrade.
- No More Nighttime Disruptions: The premium memory foam absorbs motion to keep disturbances at bay, while the 18-inch skirt and reinforced elastic ensure a snug fit around any mattress. Perfect for restless sleepers and those that sleep with a partner (including pets). Avoid the hassle of constant adjustments and start experiencing quality sleep effortlessly.
- 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 from edge to edge, preventing valleys, indentations, and compressions, so you wake-up feeling well-rested every morning.
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VALUXE 4 Inch Gel Memory Foam Mattress Topper California King Size High Density Cooling Pad Pressure Relief Bed Topper (with Removable & Washable Bamboo Cover)
VALUXE
21% OffFree Shipping
VALUXE
VALUXE 4 Inch Gel Memory Foam Mattress Topper California King Size High Density Cooling Pad Pressure Relief Bed Topper (with Removable & Washable Bamboo Cover)
21% OffFree Shipping
Why We Love It
- High-density memory foam comfort.
- Supports body contour perfectly.
- Breathable bamboo fiber cover.
Main Highlights
- 【Gel-Infused Memory Foam】Crafted with aviation-grade memory foam infused with gel beads, its optimized internal pore structure delivers supportive comfort while maintaining superior breathability.
- 【Improve sleep quality】 The 3-inch memory mattress fits the body curve and perfectly fits the body contour. Provide you with support anytime, anywhere, without any rebound pressure. Keep the spine in a neutral position, relax the muscles, and reduce morning soreness.
- 【Rest assured and reliable】CertiPUR-US certified foam meets rigorous standards for content, emissions and durability
- 【Bamboo Fiber Cover】: bamboo cover is certificated OEKO-TEX , Use skin-friendly and breathable bamboo fiber, with adjustable elastic straps and anti-slip surface backing to prevent sliding. Zipper closure for convenient disassembly and washing.
- 【Size and instructions for use】 California King 72 x 84 x 4 inches - Before first use, pls unzip and remove the cover, leave the memory foam flatly in a well ventilated area for 24-48 hours until it’s fully expanded. 10-year warranty, free replacement of non-human damage within 2 years.（Necessary maintenance: 180° horizontal flip every other month）
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Czpalo California King 4 Inch Gel Memory Foam Mattress Topper with Removable & Washable Breathable Bamboo Cover, CertiPUR-US Certified
Czpalo
15% OffFree Shipping
Czpalo
Czpalo California King 4 Inch Gel Memory Foam Mattress Topper with Removable & Washable Breathable Bamboo Cover, CertiPUR-US Certified
15% OffFree Shipping
Why We Love It
- Adapts to body shape.
- Regulates temperature effectively.
- Washable bamboo cover included.
Main Highlights
- Comfort Sleep: Experience comfort with this 4-inch gel memory foam mattress topper, designed to improve sleep quality by adapting to your body’s shape and relieving pressure points. Ideal as a california king mattress topper for those seeking deep, restorative rest.
- Breathable Cover: Keep your sleep space clean and fresh with the included removable and washable bamboo cover. This memory foam mattress topper stays secure and breathable, ensuring you enjoy a luxurious feel night after night.
- Enhance Comfort Level: Upgrade your mattress with our gel-infused memory foam mattress topper, which helps regulate temperature and dissipate heat, maintaining a cool, comfortable sleep environment.
- Adjustable Straps & Non-Slip Bottom: Equipped with adjustable straps and a non-slip bottom design to keep the memory foam mattress topper securely in place throughout the night for worry-free comfort.
- Instructions for use: Please be careful not to scratch the inner product during unpacking, Then, please put the mattress in a ventilated place for 48-72 hours until it is fully enlarged before use!
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4 Inch Firm Mattress Topper California King Size, Memory Foam Mattress Topper Extra Support, High-Density Memory Foam Bed Topper for Pain Relief, with Removable Soft Cover, CertiPUR-US Certified
Daluvenix
12% OffFree Shipping
Daluvenix
4 Inch Firm Mattress Topper California King Size, Memory Foam Mattress Topper Extra Support, High-Density Memory Foam Bed Topper for Pain Relief, with Removable Soft Cover, CertiPUR-US Certified
12% OffFree Shipping
Why We Love It
- Balanced comfort for restful sleep.
- Adjustable firmness for personalized support.
- Cooling cover enhances nighttime freshness.
Main Highlights
- 【Dual-Layer Design & Balanced Comfort 】The Daluvenix 4-inch mattress topper features a 1.5" aviation-grade gel memory foam and a 2.5" high-density support foam. Strikes an ideal balance between comfort and support, conforming to your body's contours to evenly distribute weight and alleviate pressure points.
- 【Adjustable Firmness & Pressure Relief 】The top layer offers medium comfort, while the bottom layer provides firm support. For extra firmness, simply flip the topper. The high-density support foam base offers moderate firmness, surpassing traditional memory foam in support, effectively easing back pain and discomfort
- 【Removable & Washable Cooling Cover】The Daluvenix mattress topper boasts a skin-friendly nanoparticle ice silk cover, cool to the touch and highly breathable. Its unique weaving technology enhances airflow, outperforming standard toppers in breathability and cooling. This zippered cover is easily removable and machine washable for effortless maintenance, ensuring lasting freshness and comfort throughout the night
- 【Certified Excellence & Steady Grip】Daluvenix mattress toppers bear the CertiPUR-US seal, promising reduced odor, superior materials, and enduring performance. Each foam layer undergoes meticulous compression tests to uphold durability without failure. Adjustable elastic bands paired with a skid-resistant foundation anchor the topper firmly, eliminating unwanted shifts
- 【Service & Package】We prioritize product excellence and back it with a comprehensive, year-round worry-free guarantee. Your inquiries and concerns are our priority; feel free to contact us anytime. We pledge to deliver a satisfactory resolution within 24 hours. Kindly note, upon unpacking, please allow 48-72 hours for the mattress topper to fully expand due to initial packaging compression
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4 Inch Cal King Firm Mattress Topper, Extra Firm Memory Foam Bed Topper for Pain Relief, Cooling Gel-Infused & Removable Cover, CertiPUR-US & Oeko-Tex Certified
JOYRIDE SLEEP
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JOYRIDE SLEEP
4 Inch Cal King Firm Mattress Topper, Extra Firm Memory Foam Bed Topper for Pain Relief, Cooling Gel-Infused & Removable Cover, CertiPUR-US & Oeko-Tex Certified
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Why We Love It
- Revive your old mattress.
- Dual firmness for personalized comfort.
- Cooling gel for a restful sleep.
Main Highlights
- 【TO BRING NEW LIFE TO A MATTRESS】The firm topper are used to make up for the shortcomings of your sleep surface, such as decorating and reinforcing, sagging, worn out mattresses, add mattress pads at an affordable price to renew the support of a foam mattress and give an aging mattress a few more years of life.
- 【FLIP YOUR SIDE TO CHOOSE FIRMNESS】The foam topper has two firmness for flexibility in choosing extra comfort and sleep support. It conforms better to the body's curves, providing support and keeping the spine aligned. Relieves pressure points or chronic pain, and improves sleep comfort.
- 【SLEEPS COOLER】The cooling gel absorbs heat while the ventilation holes increase airflow, allowing for heat capture and dissipation. Helps take heat away from your body faster so you can enjoy a cooler night's sleep. It can protect you from night sweats which will affect your sleep.
- 【ANTI-SLIP COVER】It has a grippy bottom and four elastic bands at each corner to fit perfectly with the mattress and stay it in place, eliminating the need to frequently adjust the position of the firm mattress topper.
- 【REMOVABLE & WASHABLE COVER】100% Polyester bedspread with zipper closure, removable and machine washable, helps to keep the mattress fresh, dry and comfortable for a long time and creates a fresh and hygienic sleeping environment.
- 【SAFE & SKIN-FRIENDLY】The memory foam is CertiPUR-US certified, and the mattress topper queen cover are OEKO-TEX certified to ensure that the item do not contain harmful chemical residues, are skin-friendly and healthy. Creating a safe sleep environment.
- 【BUY IN CONFIDENCE】JOYRIDE SLEEP after-sales team has been, any questions and suggestions, please feel free to tell us, we will provide you with solutions within 24H!
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Lucid 4 Inch Mattress Topper - California King Size - Cooling Gel Infused Memory Foam - Plush Feel Pressure Relieving Bed Topper - Mattress Pad – Ventilated Breathable Design – CertiPur Certified
LUCID
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LUCID
Lucid 4 Inch Mattress Topper - California King Size - Cooling Gel Infused Memory Foam - Plush Feel Pressure Relieving Bed Topper - Mattress Pad – Ventilated Breathable Design – CertiPur Certified
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Why We Love It
- Plush memory foam for comfort.
- Cooling gel for a refreshing sleep.
- Breathable design enhances airflow.
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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ChiXpace Dual Layer 4 Inch Memory Foam Mattress Topper California King - 2 Inch Gel Memory Foam and 2 Inch Pillow Top Mattress Pad,7-Zone Egg Crate Mattress Topper
ChiXpace
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ChiXpace
ChiXpace Dual Layer 4 Inch Memory Foam Mattress Topper California King - 2 Inch Gel Memory Foam and 2 Inch Pillow Top Mattress Pad,7-Zone Egg Crate Mattress Topper
Free Shipping
Why We Love It
- Cooling gel for comfort.
- Pain-relieving support throughout night.
- Removable, washable for hygiene.
Main Highlights
- Dual-Layer Design: Our mattress topper features a 2-inch cooling gel-infused memory foam pad and an additional 2-inch quilted pillow top cover filled with ultra-soft down alternative fiber.
- Comfortable Support: The memory foam with an egg-crate pattern provides cushioning and pressure-relieving support. The topper molds to your body shape, distributing weight evenly for ultimate support.
- Cooling & Breathable: The ultra-soft fabric and premium gel-infused memory foam create a cooling and breathable sleep environment without noise or movement.
- Removable & Washable: The mattress topper comes with a skin-friendly, removable mattress cover that is machine washable and tumble dry low for a fresh and hygienic rest.
- Luxurious Sleep Experience: Chixpace offers a commitment to providing exclusive, comfort-driven creations. Before first use, place the mattress cover in a well-ventilated area for 24-48 hours until it fully rebounds. Any slight new foam smell will dissipate over time.
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Sleep Innovations Dual Layer 4 Inch Memory Foam Mattress Topper, California King Size, Ultra Soft Support, 3 Inch Cooling Gel Memory Foam Plus 1 Inch Fluffy Pillow Top Cover
Sleep Innovations
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Sleep Innovations
Sleep Innovations Dual Layer 4 Inch Memory Foam Mattress Topper, California King Size, Ultra Soft Support, 3 Inch Cooling Gel Memory Foam Plus 1 Inch Fluffy Pillow Top Cover
Free Shipping
Why We Love It
- Plush comfort for restful sleep.
- Removable, washable cover for convenience.
- High-quality materials for durability.
Main Highlights
- Add this plush California King size gel memory foam mattress topper with two layers of cool cloudlike comfort; 3 inch gel memory foam plus a 1 inch pillow top cover for an all-over soft plush feel
- Bedtime Made Better: This gel foam mattress topper offers plush support for all sleep positions; The fluffy pillow like 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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Lucid 4 Inch Bamboo Infused Memory Foam Mattress Topper - California King Size – Cooling Ventilation – Pressure Relieving Bed Topper - Mattress Pad – CertiPur Certified
LUCID
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LUCID
Lucid 4 Inch Bamboo Infused Memory Foam Mattress Topper - California King Size – Cooling Ventilation – Pressure Relieving Bed Topper - Mattress Pad – CertiPur Certified
Free Shipping
Why We Love It
- Ultra-plush memory foam comfort.
- Bamboo charcoal keeps odors away.
- Easy unboxing and setup process.
Main Highlights
- MEMORY FOAM: 4 inches of soft memory foam provide a “sink-in” feeling to help make a firm mattress plush. Foam mattress topper is ventilated to promote air transfer for a comfortable sleep climate.
- BAMBOO CHARCOAL: Bamboo charcoal is infused in the bed topper, wicking away moisture and regulating odors for a fresh sleep environment
- PROTECT YOUR TOPPER: We recommend using a Lucid mattress protector for your bed to protect against any leaks or spills to ensure a long life of the memory foam mattress topper
- CERTIFIED FOAM: All Lucid memory foam is CertiPur-US certified for safety and performance of the mattress topper to give you peace of mind
- TOPPER IN A BOX: We design all our Lucid mattress toppers to arrive at your home in an easy-to-carry box. Simply unbox, unroll, and wait 24-48 hours for the topper to expand.