Search  for anything...
WhatsBedding

WhatsBedding 4 Inch Memory Foam Mattress Topper King for Back Pain Relief, Filled with Breathable Memory Foam, Soft Fluffy Supportive Bed Mattress Topper, 80x78x4 in

  • Based on 48 reviews
Condition: New
Checking for inventory...

Notify me when this product is back in stock

$49.99 Why this price?
Save $6.00 was $55.99

Buy Now, Pay Later

As low as $8.33 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

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.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Unavailable
Fulfilled by Amazon
Available payment plans shown during checkout

Recently Viewed

Color: White(4in)


Size: King


Features

  • Good support, fluffy and soft Skin-friendly breathable mattress cover, Combines the softness of Gel memory foam with the support of shredded memory foam, enhanced pressure relief and breathable surface for comfortable sleep.
  • Ergonomic designFits the body curve to relieve pressure and pain. While ensuring support, it provides enough softness, bringing cloud-like comfort, balanced support and effective pressure relief, allowing you to sleep more soundly and relax.
  • Stable anchor elastic straps4 stable anchor elastic straps ensure a secure fit, keep it at the place no matter how you toss or turn on bed.
  • New dot quilting designThis mattress topper is made of high-quality fabrics and New dot quilting technology to ensure that the filling is evenly distributed and prevent lumps after long-term use.
  • Warm TipsOur mattress topper is vacuum compressed and packed. Due to the lack of air, it may not look thick enough after opening. Please pat the mattress cover gently and let it stand for 24 hours to achieve the best fluffiness. Whatsbedding focuses on customers' shopping experience. If you have any questions or concerns, please feel free to let us know!

Brand: WhatsBedding


Color: White(4in)


Size: King


Fabric Type: Polyester


Special Feature: Bagged, Pillow Top


Brand Name: WhatsBedding


Age Range Description: All


Model Name: Memory Foam Mattress Topper


Number of Items: 1


Manufacturer: WhatsBedding


Unit Count: 1.0 Count


Item Type Name: mattress topper


Other Special Features of the Product: Bagged, Pillow Top


Closure Type: Pull On


Water Resistance Level: Not Water Resistant


Fabric Type: Polyester


Product Care Instructions: Dry Clean Only


Material Type: Memory Foam


Thread Count: 400


Size: King


Color: White(4in)


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Was worth every penny
It's fluffy and comfortable quality is great price was affordable easy to use slept good through the night
Reviewed in the United States on April 4, 2026 by Lisa Farrell
    • Pat/ Knit the foam areas the first 1.5 hours to help it expand!
This Mattress cover has completely changed our sleep! We have been sleeping on an older mattress that has hardened over time. We have had problems with back pain and constantly waking up. The set up was pretty easy; I saw some reviews where they had trouble with fluffing it all the way, when I received the package I spread it completely out and began knitting the cushioned area; I would do so every 15-20 minutes; after a hour and a half of this process I let it finish rising without the knitting process. After around 3-4 hours it completely finished. We’ve had this product about 2 weeks and we haven’t had any issues! ... show more
Reviewed in the United States on January 19, 2026 by Makayla
    • Do not buy this
Worst purchase I have ever made let it sit unfolded for about 36 hours then put it on my bed it was very lumpy I have slept on it for over a week and it is still lumpy taking it off my bed and will purchase something else I would not recommend buying this product.
Reviewed in the United States on December 28, 2025 by Amazon Customer
    • Definitely A Must Have
I ordered this 4 inch Memory Foam for.our king size bed. Wow. It has made a big difference in our sleep. It was easy to install and it is so comfortable
Reviewed in the United States on January 20, 2026 by Darla Godeaux
    • Love
It’s been almost a month now. Love this!
Reviewed in the United States on January 26, 2026 by Andrea Parker
    • Comfort
It's lumpy. Not very comfortable it's not what the product described
Reviewed in the United States on December 23, 2025 by terrie schmidt
    • Awesome. Super soft memory foam. Cooling as well.
Amazing. Super soft. Give it time to fluff. But amazing topper
Reviewed in the United States on December 2, 2025 by Autumn
    • The thickness
The mattress pad is is fantastic you can fluff it up too .
Reviewed in the United States on January 7, 2026 by Dirk Adams

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for inventory...