Zinus 12 Inch King Green Tea Memory Foam Mattress, Medium Firm Feel | Pressure-Relieving Comfort & Full-Body Support, Naturally Fresh, CertiPUR-US & OEKO-TEX Certified Safe Materials
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Availability:
In Stock.
Arrives
Aug 11 – Aug 12
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Color: White
Size: King
Style: 12"
Features
- ZINUS GREEN TEA MEMORY FOAM Patented zoned pressure relief, medium firm feel, breathable knitted cover, and a durable base foam every layer engineered to contour, support, and move with your body for a better night's sleep.
- THE BENEFITS OF MEMORY FOAM Contours to your body for personalized comfort, absorbs movement so you sleep undisturbed, and works as a system with a breathable knitted cover and durable base foam for lasting support.
- PRESSURE RELIEF FOR EVERY SLEEP POSITION Zinus' patented zoned pressure relief technology means different areas respond differently to weight and pressure, so every sleep position gets the right balance of cushioning and support.
- NATURALLY FRESH NIGHT AFTER NIGHT Infused with green tea extract and purified charcoal to neutralize odors and keep your sleep environment fresh. Any mild off-gassing smell on unboxing typically dissipates within 2448 hours.
- CERTIFIED SAFE MATERIALS Foams are CertiPUR-US certified, free from ozone depleters, formaldehyde, and heavy metals. The cover meets OEKO-TEX Standard 100, tested for over 100 harmful substances including pesticides and allergens.
- FIBERGLASS FREE This mattress contains no fiberglass anywhere in its construction. The fire safety barrier is built with certified safe alternative materials, giving you peace of mind wherever it goes in your home.
- MEDIUM FIRM FEEL The sweet spot between contouring softness and solid support. Responsive enough to move with you without the sinking of a plush mattress or the rigidity of a firm one, suited to most sleep styles.
- A SIZE AND PROFILE FOR EVERY SETUP Available in Twin through Cal King, 6" to 14". Thinner profiles suit bunk beds and trundles; mid-profiles work for guest rooms and everyday use; 14" is built for primary bedrooms.
- 10-YEAR LIMITED WARRANTY Your mattress is backed by a 10-year limited warranty. Twin and Twin XL support up to 250 lbs, while Full, Queen, King, and Cal King support up to 500 lbs. Compatible with most bed frames, platform beds, and adjustable bases.
- MATTRESS IN A BOX, READY IN HOURS Arrives compressed in a single box for easy maneuvering into any room. Simply unbox, unroll, and your mattress expands to its full shape within 2472 hours. Better nights start here.
Description
Why memory foam? Memory foam is one of the most popular mattress materials for a reason. It contours to your body, absorbs movement, and delivers a personalized sleep experience that traditional spring mattresses can't replicate. Wrapped in a breathable knitted cover and anchored by a durable base foam, every layer is designed to work together for a better night's sleep from day one. Made for every type of sleeper Whether you're a side sleeper, back sleeper, or stomach sleeper, this mattress is designed to work with your body. Zinus' patented zoned pressure relief system means different areas of the mattress respond differently to weight and pressure, so you get the right balance of cushioning and support no matter how you sleep. Medium firm: the sweet spot Not too soft, not too stiff. The medium firm feel contours without sinking, supports without rigidity, and moves with you through the night. If you've struggled to find a firmness that works, medium firm is where most sleepers land. Safe for your family, certified by experts This mattress contains no fiberglass. The cover is OEKO-TEX® Standard 100 certified, tested for harmful substances, and all foams are CertiPUR-US® certified — meaning no formaldehyde, no mercury, no lead, and no ozone-depleting chemicals. The foams are also free from phthalates regulated by the U.S. Consumer Product Safety Commission, and screened for chemicals classified as carcinogens, mutagens, or reproductive toxins. The kind of verified safety standard you'd want in your primary bedroom. What keeps it fresh? Infused with green tea extract and purified charcoal, this mattress is designed to neutralize odors and keep your sleep environment consistently fresh. If you notice a mild smell when first unboxing, that's normal off-gassing and it typically dissipates within 24–48 hours. Setup is simple Unbox, unroll, and let it expand for 24–72 hours before sleeping on it. Pairs with most platform beds, box springs, and adjustable bases.
Brand: Zinus
Size: King
Product Dimensions: 80"L x 76"W x 12"Th
Item Weight: 16.93 kg
Item Firmness Description: Medium
Top Style: Tight Top
Cover Material: Polyester
Number of Layers: 3
Fill Material: High Density Foam, Memory Foam
Weight Limit: 500 pounds
Item Firmness Description: Medium
Number of Layers: 3
Weight Capacity Maximum: 500 pounds
Additional Features: Breathable, Pressure Relief
Construction Type: Memory Foam
Size: King
Item Dimensions L x W x Thickness: 80"L x 76"W x 12"Th
Item Weight: 16.93 kg
Item Thickness: 12 inches
Item Depth: 12 inches
Item Dimensions: 80 x 76 x 12 inches
Cover Material: Polyester
Fill Material: High Density Foam, Memory Foam
Product Care Instructions: Spot Clean Only
Mattress Comfort Layer Material: Memory foam
Material Type: Foam
top-style: Tight Top
Color: White
Shape: Rectangular
Style Name: 12"
Brand Name: Zinus
Model Name: Green Tea Memory Foam Mattress
Product Benefits: Provides pressure relief and a comfortable sleep experience
Model Number: ZU-MFMA1ZZI-12K
UPC: 841550362541
Number of Items: 1
Mattress Type: Standard Mattress
Number of Packs: 1
Global Trade Identification Number: 41
Manufacturer: Zinus
Unit Count: 1 Count
Age Range Description: Adult
Included Components: Mattress
Item Type Name: Bed Mattress Conventional
Manufacturer Part Number: ZU-MFMA1ZZI-12K
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Aug 11 – Aug 12
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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Similar Products
Top Amazon Reviews
Color: White
Size: Queen
Style: 12"
We slept on this mattress at a resort cabin in Chattanooga. I called the owner to learn the brand because we liked it so much. Been sleeping on it now for several months. It feels very firm when you first lie down, but give it a chance. The memory foam slowly molds to your shape, but not so much so that it grabs you or holds you stuck in place. So, it's easy to roll over. We are both side sleepers and notice we sleep longer in one position with no pressure points on our hips or shoulders. A big benefit is is no sag in the middle because our combined weight that used to make us roll to the middle and go bump in the night even in our spendy Sleep Number matress. The Zinus is cool in the summer and warm in the winter. Setting up was simple. The new foam smell was mild and faded rapidly so we slept on it after only 24 hours of letting is expand. It's heavy, so you'll want a hard, smoot base instead of a fabric box spring if you want to slide it around. and you'll definitely want two people if you want to move it to another room. The price/quality ratio here is remarkalble.
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Reviewed in the United States on July 12, 2026 by Mattson Entertainment
Color: White
Size: King
Style: 12"
I've had this mattress for about a week now. I keep reading conflicting reviews which make me think the company changed the mattress at some point. Even the title says new version so that could be why so many different experiences. I'll start off by saying I'm a 36 year old female I typically sleep on my sides or back. I usually sweat a lot. I'm about 150lbs my son is 8. Back story I just moved and my old memory foam mattress was over 10 years old and was really needing to be replaced. My Chihuahua recently died from a cancerous tumor on her foot and it was bleeding and leaking all over my old mattress. My young son and our opossum also share the bed with me and my son gets nose bleeds quite often. A gallon of milk got dumped on it at one point, peed on, moved a few times once in the rain so it had really been abused but it was still the most comfortable bed I had ever slept on even after 10 years. I even sprayed it down with bleach a few times because of what I just said and even vinegar, rubbing alcohol, peroxide, you name it and it held up great. Only problem was i had no idea what brand it was only that it was memory foam so unfortunately I had no way of ordering the same bed as my old one. This mattress: Smell So i just moved to a new area far away from where I used to live and figured I'd buy a new mattress and just put the mattress directly on the floor so I didn't have to move my whole bed etc. lots of the reviews people complain about a strong smell. I didn't notice any type of smell whatsoever even putting my face in it and taking a big whiff straight out the box. The mattress inflated immediately and although I didn't measure it, I slept on it about 4 hours after I unboxed it. It's now been a week and feels and looks exactly like it did 5 minutes after taking it out of the box. Firmness: Lots of reviews say how firm and hard the mattress is. Mine was listed as medium firmness and although I prefer a firmer mattress I went ahead and ordered it because most of the reviews say it's firmer than expected. I would say it's medium to soft. It definitely sinks in more than my old one did. I sit in bed alot with my back up against the headboard/ wall and I can tell my butt is sunken in way more than my old mattress and my butt is obviously lower than my feet when sitting up in bed. It is comfortable to sleep on but it does take a second to plump back up after I get up or change positions. Cover It says the mattress comes with a removable cover and reviews say it has a zipper. I could tell the bottom side from the top because it looks different and different material. I haven't messed with the zipper but one review said it's a fake zipper. Not sure about mine. The mattress came with the cover already on it and I haven't tried to remove it yet. My roommates son peed on it this evening and now I am wondering and hoping the cover is waterproof. By the look and feel of it I'm guessing it isn't. I will be updating my review as time goes by and say how easy it is to remove, how it holds up in the wash and how easy it is to get back on as well as what the actual mattress looks like without the cover but for now I just blotted up the pee with a clean towel and sprayed it with disinfectant and blotted again. Fingers crossed. I've also read conflicting reviews about weather or not you can flip the mattress and sleep on either side. Some say you can't some say you can. Im guessing if the cover is removed and the mattress is flipped and the cover is put back on zipper still underneath it might work but the position of the zipper wouldn't be comfortable to sleep on as it's not along the edge of the mattress but again I'll update my review when I cross that bridge. The description does show the different layers that make up the mattress so I could understand why some reviews say you can't flip it. Temperature The description says cooling and Its hard to tell because i now live in a new place further south and I have a roommate that keeps this place warmer than what I'm used to. Because of that, I now sleep with a fan although I didn't used to but so far I haven't woken up sweating yet. Size This is supposed to be a 12 in. King mattress and although I didn't measure it, my sheets do fit the same way they did before... Pretty damn tight. I think next time I buy sheets I'm gonna get the extra deep kind because it is fairly difficult to get the sheets on. I may even get a foam topper just as an extra layer of protection too since I was so hard on my old mattress and this one already got peed on and my current sheets definitely won't fit if I add a topper. That will be easier to replace when it gets yucky and I'm also ordering a waterproof cover Incase this one isn't ( I'm fairly certain it isn't or the description would have said so.) Update: It's now been almost a year the mattress is completely dipped in in the center it's the most uncomfortable soft mattress I've ever slept on I really wish I would have gotten the protection plan because I spent $400 on it and the bed sucks I'm now looking for a firm mattress this bed is horrible and it didn't even last a year I never had back pain until a couple months after sleeping on it now my back and all my joints hurt I'm very upset
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Reviewed in the United States on August 11, 2024 by jessica
Color: White
Size: Full
Style: 12"
Hands down one of the best mattress I’ve purchased. I have ordered plenty of mattress from Amazon and this is the only brand that’s holds up so well. It comes in a vacuum bag but once open it inflates quick. I usually let it inflate for half a day and it’s ready to sleep on but end up night. Super thick and soft. Love that it doesn’t have springs and keeps body cool throughout night. They usually have a sale on this mattress once in a while although it’s highly worth the money you’re spending. I even have three of these in difference sizes in my home.
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Reviewed in the United States on July 25, 2026 by Stevie
Color: White
Size: King
Style: 12"
I spent a lot of time reading reviews and searching for a box mattress. I was having a lot of lower back and hip pain. Waking up sore every morning. I had an original purple mattress and absolutely loved it but after 11 years, it was no longer supporting well and had been through raising 3 babies so it was time to pitch it. I didn't have the same kind of money to buy a new purple mattress so found myself looking for a cheaper option. I tried dream cloud and nectar and was not impressed. Found a review on this mattress with someone talking about their back pain disappearing after using this mattress. Then when the black Friday sales came and this mattress was half price I couldn't pass up trying it. First couple weeks were rough. My body hurt, this mattress felt way too firm and I wasnt sure I could survive it. But I remembered reading a review before a bought my purple mattress and they said you were gonna have some soreness as your body realigned after years of failed support in a mattress. It took a few weeks before the waking up stiff and sore went away. And I realized I hadn't had any lower back or hip pain since using the mattress. 3 months later, I absolutely love this mattress. Downside, I think it holds heat and makes me overheat in the middle of the night . I just bought a cooling mattress protector to see if it will help. But it could also be my 44 year old body acting up. Oh and an extra plus, I also don't feel my spouse tossing around all night.
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Reviewed in the United States on March 22, 2026 by Angie B.
Color: White
Size: Full
Style: 12"
It's important to note that the firmness of this mattress depends HEAVILY on the temperature of your living space!! During warm summer weather, it softens up and feels more like a medium mattress. In colder temperatures, it is definitely FIRM. This was not particularly a deal breaker for me, but I know it can be for some people so I wanted to note this. I still find myself sleeping comfortably in either firmness. This mattress is pretty much exactly what you would expect from an affordable mattress. You definitely aren't getting amazing comfort from it, but its very reasonable for the price. I just needed something for my office/spare bedroom and only sleep in it occasionally. It feels supportive and conforms to your body after laying it in for a bit (but this does, in turn, make it more difficult to move around). My biggest complaint about this mattress is the packaging it comes in. The box is heavy and awkward to maneuver around even with two people. Once it's out of the box though, setup is very easy. You just unroll it and take it out of the plastic wrap, giving it at least 12 hours to expand. I bought the full size 12in mattress, and it expanded all the way within that time frame. The mattress also had no noticeable smell out of the box, which I was pleased with. Overall, this is a convenient budget mattress for a spare room/minimal usage, but I'm not sure how suitable it would be for everyday use. The differences in firmness depending on the temperature are definitely a major factor in this—it may be jarring to feel like you're sleeping in a firm bed some nights and a medium one other nights. Breaking it in may help with this or soften it over time, but I haven't tested it myself. If you're looking for a long term, daily-use mattress, I would recommend investing in something with less variability in its firmness.
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Reviewed in the United States on April 30, 2026 by fruitpunch
Color: White
Size: Full
Style: 12"
I bought this new version of the ZINUS 12-inch Green Tea Memory Foam Mattress, and it has completely transformed my sleep quality. In fact, I am so impressed with the comfort and engineering that I am already purchasing a second one for our guest bedroom! Perfect Balance of Support and Comfort The medium-firm rating is absolutely spot on. It provides a solid, supportive alignment for your spine while still contouring beautifully to your shoulders and hips. The memory foam cradles your pressure points perfectly, giving you that luxurious "sleeping on a cloud" sensation without making you feel trapped or stuck in the bed. Cool, Fresh, and Clean The green tea and charcoal infusion is a total game-changer. It keeps the mattress smelling completely fresh right out of the box and actively prevents any stale odors from building up over time. It also breathes incredibly well, keeping me cool and comfortable throughout the entire night. Fiberglass-Free Peace of Mind The absolute best part about this upgraded version is the 100% fiberglass-free construction. Knowing that the mattress is built with safe, premium materials means I can sleep with total peace of mind regarding my family's health and home safety. Zero Motion Transfer The isolation on this foam layer is flawless. If you sleep with a partner or pets, you will completely forget they are there—there is absolutely zero motion transfer when someone shifts or rolls over during the night. It unboxed easily, expanded to its full 12 inches incredibly fast, and looks beautiful on the frame. For the price, the quality is completely unmatched. If you are looking for a safe, supportive, and luxurious upgrade, this mattress is worth every single penny!
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Reviewed in the United States on July 13, 2026 by Amber Patel
Color: White
Size: King
Style: 12"
I decided to replace my existing 12-inch thick King-sized Sersper (also memory foam, mattress-in-a-box) mattress with this Zinus 12-inch King Green Tea Memory Foam mattress, after sleeping on one at a AirBNB rental. Why? Because the Sersper mattress, which was advertised to be medium-firm, just like this one, was NOT medium-firm. Both my wife and I would sink into the mattress...and I had to add several toppers to the mattress to firm it up properly. Even then, if you sat up on the mattress or sat on the side of it, it would sink considerably, almost flatten when someone would sit on the side of it. The Zinus mattress was FAR more supportive, and much more firm. My wife and I could lay on it and not sink into the mattress...this was what I had hoped my other memory foam (Sersper) mattress would provide, but it simply did not. It's worth noting that the Sersper mattress cost more than twice as much. Into the trash it went. When it comes to memory foam mattress-in-a-box, more expensive does NOT mean better quality or support. If a mattress has the word "firm" anywhere associated with it...a human body, regardless of weight or size, should NOT sink into the mattress, beyond the small contours for hips, elbows, and pressure points. The only difference between a firm/medium firm mattress and a hard floor should be the ever-so slight cushioning the mattress provides to allow some contouring to the body. Firmer mattresses are better for supporting the lower back, as nothing will wreck your back faster than a sagging mattress. I'm a rather avg-sized guy, 5'10 180 lbs, there's no reason I should be sinking into a memory foam mattress, period, unless it's some sort of plush/soft sort of deal with no back support whatsoever. If the mattress causes any pressure-point soreness, add a latex egg-shell topper, they're worth their weight in gold. Zinus memory foam mattresses are some of the firmest available...compared to Nectar, Sersper, and others, there's far less "sinkage" when laying on Zinus mattresses. If you don't like your mattress to be firm, look at other brands, such as Nectar, which cost 3-4x as much, and allow more "sinking" into the mattress. The Zinus mattresses are nice and firm...you'll find that most reviews make note of this. The reviewers complaining about sinking in are either reviewing the wrong mattress, or weigh over 500 lbs.
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Reviewed in the United States on February 21, 2026 by ChrisWNY
Color: White
Size: Queen
Style: 12"
The mattress I needed to replace was no longer available on Amazon, but this one looked to have a similar construction. I do enjoy a soft mattress as it helps my hips, which seem to have issues staying in place. A firm mattress causes me hip pain. I will say that I have slept very well with this mattress, and I'm not waking up with pain in the middle of the night. While I do get good sleep, this foam allows the largest dent I have ever experienced in a memory foam before. My body gets absorbed by the mattress with a 2"-3" divot. I have to exert great amounts of abdominal strength to hurl myself out of bed, which is easier in the morning and not so easy in the middle of the night when I need to relieve my bladder. Since this is so soft, it is terrible to sit up for lengthy periods of time. I generally enjoy watching TV from bed before hitting the pillow for a night's slumber, but I find sitting on this bed to be painful. The foam just sinks deeper and deeper, and my body is fighting to sit, which then causes me hip pain. This bed is hot! It reflects the body and causes me to feel overheated in the middle of the night. Throwing covers off me helps, but it causes this effect where I feel hot where my body is touching the mattress and cool on top because I don't have covers. I would not purchase this again but it will suffice until I need a new matress.
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Reviewed in the United States on May 30, 2025 by Elisha