Lucid 4 Inch Memory Foam Mattress Topper, California King Size – Cooling Gel Bed Topper – Preassure-Relieving Ultra Plush Feel – Ventilated Breathable Design – CertiPur Certified - Dorm Essentials
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Availability:
In Stock.
Arrives
Saturday, Apr 25
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Size: California King
Style: 4 Inch
Color: Blue Gel
Features
- Memory Foam
- ULTRA PLUSH FEEL Lucid memory foam mattress toppers are designed to enhance a mattress, making your sleep experience softer; four inches of plush memory foam feels light, airy, and responsive
- COOLER SLEEP: Cooling gel is infused in the memory foam to help regulate your sleep temperature and keep you comfortable all night long; precision-cut ventilation channels help increase airflow to keep you cooler
- CHOOSE YOUR SIZE: 2-inch profile adds a soft layer of support to any mattress; 3-inch profile is very plush and adds even more comfort; 4-inch profile has an extra deep, plush, sink-in feel
- 3-YEAR WARRANTY: This mattress topper is assembled with CertiPUR-US certified foam and backed by a 3-year limited warranty; use with a waterproof mattress protector for best results
- SHIPS IN A BOX: Mattress topper is compressed and shipped in a box for ultimate convenience; when it arrives, simply unroll it and allow 24-48 hours to fully decompress
Description
The LUCID 4 Inch Gel Memory Foam Mattress Topper adds new life to and enhances the comfort of an existing mattress. LUCID's thickest mattress topper, this ultra thick comfort layer is made of plush, gel-infused memory foam for supreme comfort. LUCID memory foam compresses evenly beneath the unique weight and shape of a body, conforming to curves to relieve pressure at the shoulders and hips. Top quality foam is infused with advanced gel material that captures and distributes heat for a more comfortable sleep temperature. Mattress topper has a ventilated design that improves breathability for refreshing sleep.
Brand: LUCID
Color: Blue Gel
Size: California King
Fabric Type: Memory Foam
Special Feature: Gel Memory Foam
Brand Name: LUCID
Age Range Description: Adult
Model Name: 4 Inch Gel Memory Foam Mattress Topper - Ventilated Design - Ultra Plush - California King
Number of Items: 1
Manufacturer: LUCID
UPC: 848971052013
Global Trade Identification Number: 13
Manufacturer Part Number: LU40CK30GT
Model Number: LU40CK30GT
Manufacturer Warranty Description: 3-year warranty against manufacturer's defects.
Included Components: Mattress Topper
Unit Count: 1.0 Count
Item Weight: 27.9 Pounds
Item Type Name: 4 Inch Gel Memory Foam Mattress Topper - Ventilated Design - Ultra Plush - California King
Other Special Features of the Product: Gel Memory Foam
Closure Type: Pull On
Water Resistance Level: Not Water Resistant
Fabric Type: Memory Foam
Product Care Instructions: Spot Clean Only
Material Type: Memory Foam
Size: California King
Color: Blue Gel
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Apr 25
Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Twin XL
Style: 3 Inch
Color: Blue Gel
This has been probably one of the best products I’ve purchased through Amazon! SO comfortable and tames down my aches, pains and muscle stiffness throughout the night for better sleep and way less pain the next morning. It does make it harder to turn in bed, and I do get a little warm from laying on it (not extreme warmth), but the benefits are worth it. Others foams I’ve tried aren’t even close to the comfort I get from this product.
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Reviewed in the United States on March 19, 2026 by One Desert Rose
Size: Queen
Style: 4 Inch
Color: Blue Gel
Whoa. This thing blew my mind night #1. I turned once and woke up 8 hours later, refreshed and happy. Idk how long it will last, but its perfect right out of the box. HIGHLY RECOMMENDED. No bad gas off smell. Cooling was unknown because it knocked me out, lol. I have the 4" and you sink into it in your core but its not unpleasant.
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Reviewed in the United States on March 11, 2026 by Craig L.
Size: King
Style: 3 Inch
Color: Blue Gel
Seriously, my prayers have been answered. I only wish I would have thought to invest in this mattress topper while I was pregnant. It might have saved me a huge headache (literally). I've never had much luck with mattresses, but I've never really blamed the mattresses - because I suck at sleeping. Apparently, I'm a contortionist in my sleep and do things with my body that would give little Linda Blair a run for her money. I wake up a million times a night with pains in my head, my neck, my back, my hips, my legs, literally everywhere. However, I've had a friend come over to help with my new baby and I happen to have the same mattress in the guest room that I have in my main bedroom. She brought it up to me one day that her hip and lower back were killing her since sleeping on the mattress in the guest room- even though it is a pretty expensive pillow-top brand. She asked me if I could order her some kind of mattress topper from Amazon and she'd reimburse me. At this point, I had been in so much agony myself that I got two - one for the guest bed and one for mine. And if it weren't for the fact that I only have nightmares, I'd insist that I'm dreaming up this amazing experience with this mattress topper. I mean, I really don't even have words for this thing. I'm not pain free - because, well, it's gonna take a lot of time to undo that kind of damage. But I have noticed a dramatic difference. My body feels so soothingly cradled. I'm not tossing and turning constantly trying to get comfortable. It's just pure bliss. This may sound strange, but it feels like a hug. It does. It really does. Like a hug from the Pillsbury Dough Boy. Some Technical Details: 1) It was very easy to set up. 2) There was only a very faint odor that dissipated almost immediately. 3) I was so desperate to use it that I didn't even wait the full 48 hours as suggested but it seemed to be super plump straight out of the box. The density is perfect for me. 4) It fit absolutely perfectly across my king-sized bed 5) It appears to be of durable quality unlike some toppers I have seen or used in the past that easily shred or discolored. Time will be the ultimate test so I can't 100 percent guarantee this but judging from observation this would appear to be the case. I will update as necessary. 6) It does live up to the claim about not retaining heat and keeping the body a cool and comfortable temperature (which is crucial for a person like me because I practically need to live in an igloo). So yes, I'm very impressed thus far and absolutely I would recommend this to anyone and everyone. I've honestly never been this excited to go to sleep. My fiance loves it and he was a bit upset that I got it in the first place because he loved the mattress the way it was, but now he loves THIS more. And even my little doggie who has become a neurotic mess since my baby was born seems to be a tad more comforted and peaceful sleeping next to me now. Just writing about it makes me want to go upstairs and jump in bed. I'm starting to wonder if they put something inside this thing if you know what I'm talking about, because I'm addicted. Just kidding... Maybe.
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Reviewed in the United States on June 18, 2017 by Khaleesi'sHandMaiden
Size: Queen
Style: 4 Inch
Color: Blue Gel
Great for back, hip and other body pain. This is my 4th mattress topper in over 10 years, my second LUCID topper. I have severe chronic musculoskeletal pain in many areas of my body that keep getting worse. So far, this is the best topper. It doesn’t trap heat like others. It’s a bit tough to get out of, but the sleep benefits I get are well worth a little inconvenience. I was on the fence between 3 and 4 inch depth. I’ve had 3” toppers before, but picked 4 because the older I get, the worse my sleep gets. This 4” topper increased the quality of sleep. That’s all a chronic pain patient can ask for.
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Reviewed in the United States on February 23, 2026 by Donna D.
Size: King
Style: 3 Inch
Color: Bamboo Charcoal
The topper looks just like the picture shown. Our bed is years old. The mattress is still in decent condition. It's one the flips over and has a pillow top on both sides. We've always been good about flipping and rotating it. But, time wears on. I have neuropathy and I was noticing that my hands and arms were falling asleep or tingling every morning. I have had to wear braces. Plus my lower back would take a while of creaking to warm up and not be sore. I have one hip that had started to hurt. I'm not getting into the husband's side. We are both healthy and keep in pretty good shape so I just knew some of this was the mattress. Was I ready to spend another $1K or more on a mattress....ummmm....nope! I had slept on a friend's bed who had gotten a memory foam mattress and liked it. Then I started researching the toppers. I have been looking into a topper for months. Figured I would give it a shot. Hopefully sleep better and save a little money. Thank you Prime Day! haha After reading about everything I could and then reading reviews, comparing prices etc, I decided on this. Hallelujah!! I picked this one because it had good reviews on temperature. I run hot so I needed something that wouldn't make me sweat. I liked the bamboo and charcoal features. This came perfectly packaged. Easy to open (provided a razor tool for the plastic) and lay out. There was absolutely NO SMELL. I was worried. I put my face right into it. Nothing. I have a small house so there was no way I was able to stick a king sized topper somewhere for 48 hours, so this only sat for about 14 hours. It did start to expand immediately after being laid out. I already had a pillow mattress cover w/ deep pockets and it fits right over it. I have slept on this for 2 nights so I might be pulling the trigger early on a review, but I will definitely update this if necessary. Night one: I could definitely tell a difference. It was very comfortable. I was worried about too soft or too firm, but like goldilocks, it was just right. It is soft enough that you sink into it, but firm enough that you are not in a hole (if that makes sense). I was not hot at all. Summer is definitely a time to test that out. Night two: I think I liked it even better last night. Just a huge difference. Even lying on it to read. I was comfortable with no aches. Huge difference in the morning. I haven't worn my arm braces and my arms and hands have not had any pins and needles or numbness. My hip has not bothered me and my lower back doesn't feel like I have to oil it up before exercising or just breathing. At this point, I would definitely recommend this topper. I know there are so many out there. My suggestion is don't rush it. Read reviews on and off of Amazon. Going through though, add this one to your list of a possibility. I will add too that I was thinking I would need a 4 inch, but I did read somewhere that someone stated that it feels like you sink further down with a 4inch so I got the 3 and it's perfect for my needs. Sorry so long, but I invested a lot of time into this. haha
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Reviewed in the United States on July 19, 2023 by MrsWorldwide