10 Best 4 Inch Memory Foam Mattress Topper California King of 2025

Last updated on 07/17/2025

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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 4 Inch Gel Memory Foam Mattress Topper California King Size High Density Cooling Pad Pressure Relief Bed Topper (with Removable & Washable Bamboo Cover)

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）

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 for Back

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 for Back

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 35D foam with an egg-crate pattern provides cushioning and pressure-relieving support, making it ideal for those with chronic pain. 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.

ViscoSoft 4 Inch Pillow Top Memory Foam Mattress Topper California King - Cooling Hybrid Lux Dual Layer Mattress Bed Pad - CertiPur-US Certified

ViscoSoft 4 Inch Pillow Top Memory Foam Mattress Topper California King - Cooling Hybrid Lux Dual Layer Mattress Bed Pad - CertiPur-US Certified

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.

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

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

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

LUCID 4 Inch Gel Memory Foam Mattress Topper Only-Ventilated Design-Ultra Plush-California King

LUCID 4 Inch Gel Memory Foam Mattress Topper Only-Ventilated Design-Ultra Plush-California King

Plush memory foam for comfort.
Cooling gel for a refreshing sleep.
Breathable design enhances airflow.

Main Highlights

4 inches of thick, plush gel memory foam add a soft and conforming feel that will result in a deeper sink that cradles your body more than a thinner topper
Infused with gel material that captures and distributes heat for a cooler memory foam experience
Ventilated design improves airflow and breathability
Memory foam distributes weight evenly and conforms to curves to alleviate pressure points

Lucid 4 Inch Ventilated Bamboo Charcoal Memory Foam Mattress Topper, CertiPUR-US Certified, Moisture and Odor Control-Cal King

Lucid 4 Inch Ventilated Bamboo Charcoal Memory Foam Mattress Topper, CertiPUR-US Certified, Moisture and Odor Control-Cal King

Ultra-plush memory foam comfort.
Bamboo charcoal keeps odors away.
Easy unboxing and setup process.

Main Highlights

Plush, therapeutic memory foam conforms to your curves
Memory foam adds softness and increased comfort to your mattress
Naturally hypoallergenic, memory foam resists bacterial growth for a clean sleep environment
Infused bamboo charcoal helps regulate moisture, temperature, and odor
New foam scent is normal and will dissipate over the first 48 hours after opening; this product features a 3-year warranty

Subrtex Mattress Topper, Gel-Infused Memory Foam Mattress Topper, High Density Cooling Bed Topper Pad with Breathable Removable Fitted Cover CertiPUR-US Certified (4 Inch, King)

Subrtex Mattress Topper, Gel-Infused Memory Foam Mattress Topper, High Density Cooling Bed Topper Pad with Breathable Removable Fitted Cover CertiPUR-US Certified (4 Inch, King)

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Soft, breathable, body-contouring support.
Removable, washable, and convenient cover.
Certified for safety and durability.

Main Highlights

Inner memory foam: Gel-infused memory foam mattress topper utilizes high-density memory foam. Provides soft, breathable, body-contouring support.
Removable & washable cover: The rayon made from bamboo cover adopts skin-friendly fabric, adjustable straps for mattresses up to 12" deep, mesh backing to prevent sliding and zipper for easy removal and washing
Healthier sleep environment: Our foam mattress topper is certified by CertiPUR-US and OEKO-TEX, ensuring durability and safety without formaldehyde or harmful phthalates
Advanced shipping: Allow the memory foam to lie flat in a well-ventilated area for 48-72 hours. Low temperature may need more time, find a suitable temperature(78℉) will shorten the time. Memory foam care: spot clean, do not place in the washing machine or dryer
Ten-year: We will provide peace of mind for your purchase. Please Choose with confidence. 10-year warranty, free replacement of non-human damage within 2 years.

Lucid 4 Inch Lavender Infused Memory Foam Mattress Topper - Ventilated Design – Pressure Relieving Bed Topper - Mattress Pad – CertiPur Certified - California King Size

Lucid 4 Inch Lavender Infused Memory Foam Mattress Topper - Ventilated Design – Pressure Relieving Bed Topper - Mattress Pad – CertiPur Certified - California King Size

6% OffFree Shipping

Luxurious plushness enhances comfort.
Calming lavender promotes relaxation.
Breathable design keeps cool.

Main Highlights

IMPROVE YOUR SLEEP: An ultra-plush, 4-inch memory foam mattress topper can extend the life of your mattress, soften a too-firm mattress, or make any mattress feel a little bit better
CALMING LAVENDER INFUSION: This topper is infused with natural lavender essential oil that helps create a soothing sleep environment
INCREASED AIRFLOW: Breathable ventilation channels increase airflow and help evenly distribute the soothing lavender scent
QUALITY MATERIALS & EASY SETUP: Our foam is CertiPUR-US certified, meaning we only use quality materials to ensure your comfort and safety; the topper is compressed, rolled, and shipped in a box - simply unroll and allow 24-48 hours for expansion
PLUSH MEMORY FOAM COMFORT: Premium memory foam contours to your body to provide plush comfort while a ventilated design improves airflow to create an incredibly soft, airy, and responsive feel

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

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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Adjustable for personalized comfort.
Relieves pressure for better sleep.
Breathable material keeps you cool.

Main Highlights

Dual-Layer Luxury for Supreme Comfort: Designed with a 2-inch gel-infused memory foam base and a 2-inch plush pillow top layer, this 4 inch memory foam mattress topper california king size combines body-contouring support with cloud-like softness. Perfect for those looking to refresh their california king mattress topper without buying a new mattress.
Enhanced Pressure Relief & Body Alignment: Wake up refreshed and ache-free with the adaptive support of the california king memory foam mattress topper. It cushions pressure points and helps align the spine, making it an excellent choice for side, back, or stomach sleepers.
Snug Fit with Deep Pocket Skirt: The 360° elastic deep-pocket skirt hugs your california king size mattress like a fitted sheet, accommodating beds up to 21 inches thick. Whether you're upgrading an old mattress or enhancing a new one, this mattress topper california king size bed stays securely in place.
Cooling Comfort All Night Long: The diamond-stitched pillow top not only enhances airflow, stay cool and sweat-free through the night but adds a touch of luxury to your bedroom aesthetic. Built to withstand daily use, this pillow top mattress topper california king is both cozy and long-lasting.
Easy Setup & Simple Maintenance: Designed for quick installation, simply unfold and smooth out for instant comfort—no tools required. The removable cover is machine washable for hassle-free cleaning, ensuring your california king mattress topper stays fresh and durable with minimal effort.

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 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)

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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