Siena 12" King Memory Foam Mattress - Medium Firm - 180 Night Trial - Premium Pressure-Relieving Layers - 10 Year Warranty - Mattress in a Box - CertiPUR-US Certified
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100-day refund / replacement
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Availability:
In Stock.
Arrives
Sep 23 – Sep 24
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Size: King
Style: 12” Memory Foam
Pattern Name: Mattress
Features
- 180-NIGHT HOME TRIAL & 10 YEAR MANUFACTURER WARRANTY - Rest easy with a Siena mattress. You'll enjoy a 180-night home trial, and we stand by our product if theres any defect or flaw in your Siena in the first 10 years, we'll replace or repair it for free.
- FIVE LAYERS OF COMFORT - Siena doesnt compromise on comfort. We might cost a lot less than our competitors, but your Siena mattress sure packs a punch when it comes to responsive comfort, supporting proper spinal alignment, and relieving pressure points. With lots of motion-reducing foam, you wont be disturbed if your partner or pet moves.
- MEDIUM FIRM AND SUPPORTIVE - Finding the perfect firmness is a breeze with Siena. It's medium-firm, striking the ideal balance between comfort and support for a restful night's sleep.
- SIMPLE TO SET UP - Just move the box to the room you want to use it in, unbox and unroll your mattress, and watch it expand before your eyes. Your Siena will be snooze-ready in 24 hours!
- CertiPUR-US CERTIFIED - Your Siena meets all CertiPUR-US rigorous standards for materials, emissions, product durability and performance. This is an assessment made by independent, accredited testing laboratories. It means your Siena is made without ozone depletors, mercury, lead, formaldehyde, phthalates and other harmful substances that can be in consumer products.
- SAFE & FIBERGLASS FREE - Your Siena mattress is made without ozone depletors, mercury, lead, formaldehyde, phthalates and other harmful substances that can be in consumer products
Description
We believe everyone should be sleeping on a truly comfortable mattress. A mattress that is designed to support your body in all the right places - so you fall asleep fast & wake up feeling refreshed! A great sleep shouldn’t cost the earth. You won’t see Siena advertised on TV - we put the highest quality materials into our mattresses so you can enjoy a great sleep at a great price.
Size: King
Special Feature: 180 Night Trial, Back Pain Relief, Breathable and Cool, Low Motion Transfer, Pressure Relief
Color: White
Upholstery Fabric Type: Polyester Blend
Brand: Siena
Size: King
Special Feature: 180 Night Trial, Back Pain Relief, Breathable and Cool, Low Motion Transfer, Pressure Relief
Color: White
Upholstery Fabric Type: Polyester Blend
Brand: Siena
Included Components: Mattress
Item Weight: 75 Pounds
Age Range (Description): Adult
Product Care Instructions: Hand Wash Only
Warranty Type: Extended
Manufacturer: Siena Mattress
UPC: 810167463767
Product Dimensions: 80 x 76 x 12 inches
Item Weight: 75 pounds
Item model number: snfmtwlvbz-sking
Thickness: 12 Inches
Refill: Memory Foam
Batteries required: No
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 23 – Sep 24
Yes, absolutely! You may return this product for a full refund within 100 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: Twin
Style: 12” Memory Foam
Pattern Name: Mattress
I was pleasantly surprised by how easy this mattress was to set up, just open the box, unroll it, and let it expand. It’s the perfect balance of softness and support, making it really comfortable to sleep on. The quality feels great for the price, and it’s a fantastic option if you want a hassle-free mattress that arrives right at your door. I didn’t notice any smell and it fit great on our standard twin bed frame.
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Reviewed in the United States on August 13, 2025 by Melb1228
Size: King
Style: 12” Memory Foam
Pattern Name: Mattress
Replaced a $2000 mattress with this one and have been 100% satisfied. We purchased the 12 inch King mattress to replace a spring mattress we had invested a lot of money in. I have numerous ruptured discs in my back and problems with my SI joint, so it is difficult to find a bed that does not leave me sore in the morning and cause me to spend 45-50 minutes stretching in the morning. The description for this one has the same buzzwords you see on most mattresses about pressure relieving layers and etc. I can say that this is the first mattress I have had in years where I wake up in the morning with no pain. It quickly expanded to 11.5 inches, so did not quite make it to the 12 inches advertised, but I'm not sure that is critical because it is all about the feel. This is on the firm side of medium firm, but is very comfortable. You do not sink in, so side sleepers will find this to be very comfortable. It is cool compared to other foam mattresses we've had as well. I plan on buying a second one for our weekend home.
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Reviewed in the United States on August 17, 2025 by Russellferd
Size: Full
Style: 10” Memory Foam
Pattern Name: Mattress
Mattress in a box. Who knew? We bought this for our downstairs office/TV room. We have a nice sized bath and a walk in closet, so by adding a bed, we officially gave ourselves an extra bedroom. With a separate entrance downstairs it is great for guests. They have a microwave, coffee pot, cafe table, and a beautiful view of the mountains. Want breakfast? Make it yourselves. We tried it out a few nights and were impressed at how well we slept on it. We actually have a couch that lets out into a queen bed that has some brand name mattress, but the one time we slept on it, in a wind storm, we said we would never do it again. It was horrible. We have a Sleep Number bed and if you took away the bells and whistles, I would say this mattress sleeps just as well. Go for it.
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Reviewed in the United States on July 25, 2025 by Patty
Size: King
Style: 10” Memory Foam
Pattern Name: Mattress
Great for back and stomach sleepers but not for laying on your side since it's a firmer mattress. Only reason for 4 stars is that it does tend to sink in a little more than I'd like.
Reviewed in the United States on August 27, 2025 by Kea Williams
Size: Twin
Style: 12” Memory Foam
Pattern Name: Mattress
I am very pleased with this mattress! Very easy to set up and I've noticed my back is a lot less stiff & sore than it was with my old mattress. It's the perfect medium-firmness and there doesn't seem to be any strong smells. Definitely wait a day or so to let it fully expand to get a good idea of the actual firmness.
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Reviewed in the United States on August 12, 2025 by Chrissy L
Size: Twin XL
Style: 10” Memory Foam
Pattern Name: Mattress
It would be interesting to see how they package this mattress in the factory - unboxing was an experience! There was a label over the QR code that had the instructions, but I found it was unnecessary. Once you pry up each of the flaps (3 on each end that are glued to one another with some heavy duty glue) and push the mattress out from one end (you really do need 2 people - one to push and the other to hold the box), and start unwinding it from it's plastic wrap, you begin to understand how much the mattress is compressed! Make sure you have plenty of space as this mattress really grows! A true wonder. Enough of unboxing - this mattress is really quite good for a budget price, with sufficient support and comfort, and seems to be made very well. Sienna is the budget sister product to Nector, which is highly rated for a mid-price range memory foam mattress. I figured I couldn't go wrong with their less expensive Sienna brand. I think I made a great choice as it was clear the quality and attention to detail was top notch despite it being the budget brand. I highly recommend this mattress for a less expensive option. Read Tom's Guide for a comparison of the two brands.
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Reviewed in the United States on June 4, 2025 by Thomas D. Stade
Size: Twin
Style: 10” Memory Foam
Pattern Name: Mattress
Love this mattress was surprised how nice it was for the cost my son thinks it's the most comfortable bed he even goes around telling people about it
Reviewed in the United States on August 11, 2025 by Lydia Powell
Size: Full
Style: 10” Memory Foam
Pattern Name: Mattress
I ordered the 10” mattress. It’s very firm and very high. It was my first experience sleeping on a foam mattress. I purchased this for my daughter’s guest room so I had a comfortable place to sleep when i visited. Firstly, the mattress is too hard. Maybe it needed to be broken in. Secondly, I awoke in the middle of the night drenched in sweat. I sleep cold! I never sweat! This mattress does not breathe. The remainder of my visit, I slept comfortably on her sofa.
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Reviewed in the United States on April 17, 2025 by Miss Ellie