Mainstays 3 in Gel Memory Foam Mattress Topper, Full
Mainstays 3 in Gel Memory Foam Mattress Topper, Full
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Mainstays 3 in Gel Memory Foam Mattress Topper, Full

7,690 ratings

Key item features

  • Cooling Comfort: Gel-infused memory foam provides adaptive support, helping maintain a more comfortable sleep temperature and contouring to your body for enhanced comfort.
  • Certified Quality: The foam is CertiPUR-US certified, independently tested for its content, emissions, durability, and performance standards.
  • Full Dimensions: Sized for a standard Full mattress, this topper measures approximately 74 inches L x 53 inches W x 3 inches H, and comes as a single piece.
  • Pressure Relief: Designed to relieve pressure points and absorb movement, ensuring a more comfortable sleep surface throughout the night for various sleeping positions.
  • Easy Maintenance: For care and upkeep, the mattress topper requires spot cleaning only, ensuring simple and easy maintenance.
  • Breathable Support: Its breathable design promotes airflow, offering versatile support suitable for back, side, and stomach sleepers.
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Specs

Bed size, FullFirmness, MediumThickness, 3 inFill material, Memory FoamMaterial, Memory FoamBrand, Mainstays

About this item

Product details

This Mainstays mattress topper adds a 3 in layer of gel memory foam to a Full bed for extra cushioning and support. Sized to fit a standard Full mattress, it measures about 74 in L x 53 in W x 3 in H. The foam contours to your body to help relieve pressure points and absorb movement, so your sleep surface feels more comfortable through the night. Its breathable design promotes airflow, and the topper is made to support back, side, and stomach sleepers. It is a simple way to refresh the feel of your mattress without replacing it.
  • Gel-infused memory foam is designed to provide adaptive support and help maintain a more comfortable sleep temperature.
  • CertiPUR-US certified foam is independently tested for content, emissions, durability, and performance.
  • Full size topper measures approximately 74 in L x 53 in W x 3 in H and includes 1 piece per pack.
  • Spot Clean Only for easy care and maintenance.
info:
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Specifications

Bed size

Full

Firmness

Medium

Thickness

3 in

Fill material

Memory Foam

Warranty

Warranty information

5 Year Manufacturer's Limited Warranty

Customer ratings & reviews

4.4 out of 5 stars
stars
7,690 ratings2,096 reviews
How item rating is calculated

Reviews summary

Pros

  • : Provides a comfortable sleeping experience with a plush feel.
  • : Provides cushioning to alleviate back pain.
  • : Priced lower than similar products.
  • : Made of thick material that contours to the body.
  • : Fits standard mattress sizes with minor edge issues.

Neutral

  • : Can expand quickly, but may not reach full size.
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Filtered and sorted results would be available on the new 'Customer ratings & reviews' page.
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Showing 1-3 of 2,096 reviews

Sep 10, 2026
Reviewer name: OyuntungalagO
5 out of 5 stars
5 out of 5 stars review

Very Comfortable and Thick!

[This review was collected as part of a promotion.] I'm really happy with this 4-inch memory foam mattress topper. It arrived compressed, but after opening it and letting it expand, it reached a nice thickness and looked even all around. The foam feels soft and supportive and adds a lot of cushioning to the mattress. I especially like how thick it is—it makes a firm mattress feel much more comfortable and gives the bed a plush, cozy feel. The quality looks good for the price, and mine expanded nicely without any major uneven areas. Overall, I'm very satisfied with it so far and would definitely recommend.

Review from sinomax-usa.com
Helpful?7JB0A36A46F51329165357
Jul 21, 2026
Reviewer name: NancyA
5 out of 5 stars
5 out of 5 stars review

Great topper that provides a lot of support

[This review was collected as part of a promotion.] I am really enjoying this mattress topper! I did allow it a full day to air out and fully come to life. There is a smell, but there are instructions that state you can spray a fabric spray which I did and it helped. The four inch foam makes a huge difference. It is like sleeping on a cloud. I was able to still move around, but it conformed to my body. I slept so much better after night one. I had no issues with my sheets fitting.

Review from sinomax-usa.com
Helpful?7JB0A36A46F51329165357
Oct 12, 2026
Reviewer name: Lillie
Walmart Associate
Item details
Bed size: Twin
Thickness: 3 in
Multipack quantity: 1
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Performed just as promised, great buy!

For the price paid for this mattress, I expected to give a bit of relief but I didn't expect it to transform this bed as it has. The difference it has made in my sleep comfort is priceless. It fits perfectly, it's thick enough to make a true difference,vit has no odor, and it fluffed out fully within an hour or so. I have only a minor issue and that is that after a few days, I have to place it back in the proper position as it as moved over from its desired placement. I haven't felt it move at all, but , it does slide a tiny bit over time. For the price I paid, I can deal. I have seen a few reviews saying it makes you hot or sweat, I have not found that to be an issue whatsoever. All in all, IMO, I think this memory foam mattress topper to be a great purchase that is true to the claims made. it gives a better, more comfortable rest than I had without it. I recommend this product, as I feel it was a great purchase because quality and performance wise, it does the job it says it does. Happily recommend.

Helpful?7JB0A36A46F51329165357
Current price is Now $78.00
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was $88.00
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