Lucid 4 Inch Memory Foam Mattress Topper, Full Size – Cooling Gel Bed Topper – Preassure-Relieving Ultra Plush Feel – Ventilated Breathable Design – CertiPur Certified - Dorm Room Essentials
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FREE 90-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Friday, Apr 24
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Size: Full
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: Full
Fabric Type: Memory Foam
Special Feature: Gel Memory Foam
Brand Name: LUCID
Age Range Description: Adult
Model Name: 4 Inch Gel Memory
Number of Items: 1
Manufacturer: LUCID
UPC: 848971052020
Global Trade Identification Number: 20
Manufacturer Part Number: LU40FF30GT
Model Number: LU40FF30GT
Manufacturer Warranty Description: 3-year warranty against manufacturer's defects.
Included Components: Mattress Topper
Unit Count: 1.0 Count
Item Type Name: 4 Inch Gel Memory Foam Mattress Topper - Ventilated Design - Ultra Plush - Full
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: Full
Color: Blue Gel
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Apr 24
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: 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: Full
Style: 3 Inch
Color: Blue Gel
Got this in August of 2023 and it is still one of the best purchases I have ever made. I sleep for about 6 hours (internal clock) and I wake up with 0 pain in my hips (sciatica) I’m a side sleeper mostly but I’ve noticed I sleep on my back sometimes now. Also I’ll wake up in the same position I fell asleep in which means my sleep is not being disturbed by tossing and turning. I have fitted sheets with the elastic straps which keep it in place, although I didn’t have any issues with regular fitted sheets either. Since 23 it has retained shape and bounces back when I get up. I have this layered on a regular spring mattress. Adds softness without sacrificing support🤌🏼 coming back to review this now because I realized I have the peak bed comfort and sleep incredible.
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Reviewed in the United States on February 23, 2026 by Raven Miller
Size: King
Style: 4 Inch
Color: Blue Gel
Absolutely totally impressed by Lucid’s customer service team!! Over the last 10 years or so, I have purchased 3, 4” toppers for my bed and 2 or 3 other mattress toppers (3” I believe)for other family members beds in my home. We have good mattresses, but the best way I have found to make them last COMFORTABLY longer is to put a memory foam mattress topper on them - As well as the fact that there is nothing better for a GREAT NIGHTS SLEEP than crawling and then up into a soft, comfy “feeling like you are sleeping on 12” of goose down comforters “ bed. Lucids’s 4” memory foam mattress does just that- makes your bed feel soft and warm and comfy a just as if you were sleeping on 12” of Goose down comforters! (Saying it’s like sleeping on a soft billowy cloud would be inaccurate- you’d fall through a soft billowy cloud & hit the ground like a brick. THAT doesn’t sound comfortable in the least!! 😂😂) So, if you like sleeping on a soft bed, the 4” is perfect!! So why is Lucid’s customer service so amazing? Well, just like every single other product in the world, occasionally one of those products will be defective or something just not right with it. It happens. No matter how great & amazing a company is, it’s pure naivety to believe that they will never ever have some sort of problem with one of the hundreds of thousands of individual products they sell. I don’t mean that every single one of a product they sell will have a problem, I am saying that 1 of the hundred thousands of one specific item will come off the factory floor as defective. In the situation I am referring to, that one item out of hundreds of thousands, happened to be the most recent of 3 of the 4” toppers I have purchased from Lucid. Building a great reputation for selling great products in various shapes and sizes is one thing. How your customer service department handles a situation when a customer contacts them saying that they are having problems with one of their products because that item is defective - THAT is how a company KEEPS their well earned great reputation. In full disclosure, I did have to contact them twice, but I honestly think that the first time I either put in the wrong reply email or the message portal on their website was not working properly- which honestly, with 99% of message portals and there being people writing about various things- compliments, curiosity and complaints as well as on occasion (yes it happens) competitors spamming message portals in an attempt to bog down customer service in order to make the department look ineffective, I personally think it’s better to just use the company’s customer service/information email, making sure that you write a brief description of your reason for contacting them IN ALL CAPS SO THAT THEY SEE IT PLAIN AS DAY! (Just a little advice from someone who has purchased far too many products online lol I am getting better at not doing that 😂😂 Anyways, customer service was amazing and went above and beyond. I emailed them explaining the problem, they wrote back requesting a couple pictures so they could see what I was explaining and to pass on those pictures to product quality control and then a reply stating that they had shipped me a replacement at zero cost to me. All within 3 days! Honestly, if I had sent pictures with my first email , it most likely would’ve been taken care of in one day, so the extra two days are on me! Thank you Lucid!! You have gained a loyal customer 😊
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Reviewed in the United States on August 11, 2025 by Burtice Wood
Size: Queen
Style: 4 Inch
Color: Blue Gel
Omg this mattress topper has completely changed my sleeping quality. If you’re thinking about buying it, I kid you not just buy it. Firstly it expanded as soon as I took it out of the plastic, but I gave it a good 15 to 30 minutes, just to make sure it expanded completely to it’s full size. And this topper literally feel like laying on cloud, it’s so soft and comfy, but without making you feel sunk in. I was a little nervous, but it literally upgraded my mattress 🙌🏾
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Reviewed in the United States on February 12, 2026 by Esha
Size: Full
Style: 4 Inch
Color: Lavender
The media could not be loaded. I read most of the reviews before I buy this 4” topper infused with lavender scents! Most of the complaints from other buyers feels like that mayb some misunderstanding! At first I thought it’s $115 topper. And WOW when I placed my order at checkout they offered $20 off, I was so happy! Complaints from other buyers 1. People complain about that once they took it out, the topper cracked already? It’s most likely they forced to pull open the folded unexpanded topper open and tore it apart! My advice would be just taking the plastic package off and let it breath dun even try to spread it open! The “READ BEFORE OPENING” stated so clearly that toppers need 48 hours for expansion! Just take off the package and leave it alone! 2. The topper breaks in the long run? Actually, I got the similar cooling topper from another company for a higher price, it still got the same problem. So this time, I placed a separate order of a waterproof mattress encasement with a zipper, so I can put my mattress and topper in that case to decrease the friction between Mattress, topper and sheets! These covers also protect against allergens, dust mites, bacteria, perspiration, urine and fluids. That would be a good investment, I guess! 3. The lavender scents too strong? Same magic can fix this problem! Put the mattress encasement on the topper and mattress so the scent won’t be too strong! And it would come out slowly and last longer! 4. Back pain getting worse after using this topper? Mattress can’t help all kinds of back pain.... I’m a massage therapist, I worked at chiropractic doctor office b4, I can tell you that different type of back pain needs a different style of mattress & pillows. But to me, I got tight shoulders, numbing hand problems, so this mattress is soft enough to help me not to compress my shoulder while I’m sleeping on the sideline! If you have questions for the firmness of the topper/mattress, I believe the customer service staffs of this company would willing to answer and suggest the right one for u! 5. The mattress Absorbs heats and it’s hot? Actually, this company is not promoting the Mattress can cool you down, they just compare it to the old style foam topper/mattress say this one is cooler THAN the old fashioned one! If you really need cooling effects I would suggest u to buy the cooling gel infused one! I love Lucid products, I got 2 mattresses and one topper over the last couple years from them! They are not the top line not the best quality! But These are greater valued products with the affordable price! And yes, as you can see I was bored while I’m waiting for my topper to expand That’s why I’m writing a long-axx review for everyone! Hmmm My topper expanded to the fullest within one hour, it’s time to go! Hopes this review is helpful to other shoppers! LUCID, I really think u should offer me some discount again next time since I’m a loyal customer! Lol
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Reviewed in the United States on April 20, 2018 by John John