Jamdok

Jamdok King Size Dual Layer 4 Inch Firm Gel Memory Foam Mattress Topper for Back Pain 3 Inch

4.9(18)

103+ bought in the past month

$139.00

About this item

  • Improved Support:This mattress topper combines gel memory foam and fiber,the removable cover with 1" 600GSM of premium fluffy fiber,inner is a 3" 40D firm gel memory foam,Ideal for back and stomach sleepers looking for added firmness and stability.
  • For Bed And Floor:The pad cover has adjustable straps at all four corners and can be fixed on a 12 inch thick mattress without any problem.The bottom is made of anti slip fabric,It can also be placed directly on the floor for temporary sleep use.
  • Cool & Beathable:Gel infused material is designed with perforations and it helps with the air flow, creating a cooler and more comfortable sleeping environment.Before first use, leave the memory foam flatly in a well ventilated area for 48-72 hours until it’s fully expanded. Tips: Low temperature may need more time, find a suitable temperature(78℉) will shorten the time.
  • Machine Washable:The cover has three side zippers, you can easily remove it,and it can be directly placed in the washing machine for cleaning, without worrying about deformation. After cleaning, drying with a dryer will make it more fluffy.
  • Tips:It's normal that the new mattress has a slight odor, which will air out after 2-3 days,don't worry about this smell.
$139.00

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Product details

BrandJamdok
ColorGray
SizeKing
Fabric Type100% Polyester
Special FeatureAdjustable

Technical specifications

brandJamdok
colorGray
sizeKing
fabric_type100% Polyester
special_featureAdjustable
closure_typeZipper
product_care_instructionsMachine Wash
water_resistance_levelNot Water Resistant
age_range_descriptionAdult
materialGel Memory Foam
model_nameKing-Gray
manufacturerJamdok
item_firmness_descriptionFirm
product_dimensions79 x 75 x 4 inches
item_weight34 pounds
item_model_numberKing-Gray
best_sellers_rank#1,339,428 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #1,044 in Mattresses Toppers
date_first_availableApril 17, 2024

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Customer reviews

4.918 ratings

Customers say

Customers find the mattress topper comfortable and pain-free.

★★★★★

Arrived fast , let expand fully 2 days , installed & feels good. not as cooling as thought it would.

Steve NAugust 1, 2025

Old been installed a week, but definitely has helped hips and upper legs not hurt as they were , hopefully this is what I needed for pressure point relief …. Read more

★★★★★

Comfort! No pain!!

LindaOctober 29, 2025

I purchased this topper to put over my split king adjustable bed. It fits not exactly but almost perfect. It’s slightly short around the edges about an inch and an half all around, no big deal. The topper made the split in our bed disappear 100%, no dip , you can’t even notice there was a split. The gripper backing and corner straps keep the mattress in place perfectly. I have newer high end adjustable mattresses that I haven’t experienced a good nights sleep on it since purchased. Since placing this topper both my husband and I can’t believe how well we slept!!!! No pain in the morning and we woke up refreshed. We are both hot sleepers and this topper kept our heat levels nice and cool. The over all thickness of the topper is perfect . Prior this purchase I bought a very expensive name brand topper that went to the dog’s because it slept so hot. This toppers quality is very good and an added bonus is the cover is removable and washable. Also unlike many memory foam items, there is NO ODOR! I couldn’t be happier with this purchase!!!! Highly recommend it. Read more

Review image 1Review image 2
★★★★★

Wonderful!

FrancineDecember 5, 2025

Wonderful product! Read more

★★★★★

I love it!

patricia fretiasNovember 1, 2024

This is exactly what I was looking for to make my camper bed better. It is so comfortable and provides support I was looking for. Read more

★★★★☆

Comfortable

LoriMarch 14, 2025

Feels great. Helped with husband's back pain. Only down side. The straps to hold it to mattress. Fell off when putting on bed. I had to sew them back on. Read more

★★★★★

Excellent Value

JustamomSeptember 3, 2024

While I forgot to take a picture, let me tell you, this is one GREAT mattress topper. I love that it is not too soft. It is on the firmer side. The elastic bands have not been a great help. It does slide a bit so I am using a flannel sheet on the mattress underneath. That solved any sliding around. It was out of the box and ready to sleep on, within a night. I wanted to make sure it was completely aired out. Overall a great priced mattress topper. 2 thumbs up. Read more

★★★★★

Makes our sofa bed comfy for sleeping

2Zs 2LsAugust 8, 2024

We have a queen size sofa bed that's never been comfortable to sleep on, but the addition of this topper makes it so comfortable, our guests don't want to get up in the morning! Read more

★★★★★

Soft, well constructed and great support.

Corrections_Officer_57August 27, 2024

Extremely comfortable mattress topper with memory foam that provides wonderful support and feels luxurious. I love it! Very satisfied! Thank you! Read more

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