Siena 14" Twin XL Memory Foam Mattress & 2 Bonus Pillows - 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
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.
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Availability:
Only 9 left in stock, order soon!
Arrives
Thursday, Jul 30
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Size: Twin XL
Style: 14" Memory Foam & 2 Pillows
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.
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: Twin XL
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: Twin XL
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
Weight Limit: 500 Pounds
Item Weight: 48 Pounds
Age Range (Description): Adult
Product Care Instructions: Hand Wash Only
Form Factor: Platform Bed
Warranty Type: Limited
Manufacturer: Siena Mattress
UPC: 810167463798
Product Dimensions: 80 x 39 x 14 inches
Item Weight: 48 pounds
Item model number: snfmfrtnbz-stwinxl
Thickness: 14 Inches
Refill: Memory Foam
Batteries required: No
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jul 30
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: Queen
Style: 12” Memory Foam
Pattern Name: Mattress
This mattress really shocked me, I think it's great for all types of sleepers. I'm mostly a stomach sleeper, although I'll lay on my side and back to use my phone. This mattress is seriously awesome, no complaints. Also awesome to just sit on to use my laptop and such. It's pretty plush yet provides the right amount of support for me. I was originally apprehensive because this one is fully memory foam and I thought I needed a hybrid mattress as a stomach sleeper. Being that it's fully memory foam, I was also skeptical of the reviews that said it provides enough support. Nonetheless, I decided to just grab this one in lieu of an affordable hybrid option. I'm really glad I did because this one is great; it's super dense memory foam so it has the support, and since it's memory foam it also brings the comfort.
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Reviewed in the United States on October 18, 2025 by Amazon Customer
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Style: 12” Memory Foam
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I’m glad I risked ordering a lesser-known bed-in-box because now I have a King size bed that doesn’t stink and unraveled to its full size in a few quick hours. It fit my budget perfectly which meant now I’m sleeping in perfect comfort without racking up debt. Good quality, fits our bedframe just fine, and isn’t so heavy I can’t move it by myself (I completely manipulated the rolled package by myself but did have to chuck it down the stairs which I don’t recommend 😅 def get help moving that dense tube so you don’t hurt yourself).
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Reviewed in the United States on October 26, 2025 by Mel
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Style: 14" Memory Foam & 2 Pillows
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Very pleased with the mattress, our other memory foam mattress is a cocoon by sealy and we were hoping this would be a similar firmness, we like firm. I wouldn't call this a firm mattress, it’s noticeably softer, but good support! I’m giving 4 stars because the pillow cases have rips as if they were sliced. I’m confident this wasn’t done by me as I carefully used the device it came with to safely open the mattress and wouldn’t have been able to cut the pillow with the plastic device
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Reviewed in the United States on November 24, 2025 by Haley K Haley K
Size: Queen
Style: 14" Memory Foam & 2 Pillows
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This mattress is fabulous. I have a 14 inch. I unwrapped it on my box springs and let it "do its thing" while I did some other work around the house. Within the 1st 4 hours it had expanded to 12 inches. I put the bedding on it and let it finish and was able to sleep on it that night in pure comfort. The pillows took a bit longer because they were wrapped up in the middle of the "jelly roll" but they sleep great as well. I should have purchased this a few years ago.
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Reviewed in the United States on November 13, 2025 by David Bastle
Size: Queen
Style: 10” Memory Foam
Pattern Name: Mattress
This was the pareto optimal mattress according to NapLab and has phenomenal value for price. I would recommend looking at their website for more insights. I got the 10 inch thickness queen size, and it is quite firm and sturdy, with some give. It is also not bouncy. I would say this is better for people who like firm mattresses like me; doesn't feel at all like memory foam. I am quite light, though. There was no smell upon immediate unwrapping and the mattress inflated within 20 hours! I also appreciate that the materials used for this are certified for safety and it contains no fiberglass. My queen size sheets fit very well, and my sleep has been good also for the past four days, although if I did upgrade I would want a mattress with springs in it.
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Reviewed in the United States on September 24, 2025 by kat
Size: Full
Style: 10” Memory Foam
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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. UPDATE: we have slept on the mattress a few times and it was as nice as our Sleep Number. However, we discovered something fascinating. Hubby and I both have Apple watches. Since we upgraded in December, it suggests that hubby has sleep apnea- 10-25 breathing interruptions a night. Me, none. We recently had company for several nights and let them use our bedroom and we took the mattress in a box bedroom. NO SLEEP APNEA recorded. Was it a fluke? Nope. When company left and we moved back to the $5000 Sleep Number bed the sleep apena readings went back up. To assure ourselves, we have been switching out over the past 2 weeks. Whenever he sleeps on this mattress, his readings are normal. I am no doctor and he has not seen a doctor, and it is possible something else is causing false readings, but whatever it is, his sleep is normal on this $300 mattress and abnormal on the Sleep Number mattress, no matter what number he uses. We usually always keep SN on 100 becasue we like a firm mattress but he has experimented on all numbers. The new mattress is also firm, which we like. So, if your watch tells you have sleep apena, try a different mattress.
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Reviewed in the United States on July 25, 2025 by Patty
Size: King
Style: 12” Memory Foam
Pattern Name: Mattress
Definitely firm, which is fine. I’d prefer firm instead of soft. Nothing a 1” topper couldn't fix. Works fine with our adjustable frame. For the price, can’t beat it. This replaced out Purple 4, which has a design flaw with side foam separating and you end up falling in a divot of coils which was awful.
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Reviewed in the United States on November 15, 2025 by Alexandra N Forrester