- 180-NIGHT HOME TRIAL and 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 there’s any defect or flaw in your Siena in the first 10 years, we’ll replace or repair it for free.
- FOUR LAYERS OF COMFORT – Siena doesn’t 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 won’t be disturbed if your partner or pet moves.
- GEL MEMORY FOAM – A 1.5″ layer of pressure relieving gel memory foam adapts to your unique body shape and size, while contouring to your curves.
- 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.
- 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
-40%New
Siena 8” King Gel Memory Foam Mattress – Medium Firm – 180 Night Trial – Premium Pressure-Relieving Layers – 10 Year Warranty – Mattress in a Box – CertiPUR-US Certified
$199.00 Save:$130.00(40%)
Available in stock
Last updated on July 6, 2025 6:27 am Details
Description
Additional information
| Product Dimensions | 80 x 76 x 8 inches |
|---|---|
| Item Weight | 55 pounds |
| Manufacturer | Siena Mattress |
| Country of Origin | USA |
| Item model number | SIENA-KING-8GEL |
| Thickness | 8 Inches |
| Refill | Gel Memory Foam, Memory Foam |
| Form Factor | Platform Bed |
| Care instructions | Hand Wash Only |
| Assembly required | No |
| Batteries required | No |
| Included Components | Mattress |
Reviews (697)
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![ZINUS 6 Inch Ultima Memory Foam Mattress [New Version], Twin, Fiberglass Free, Medium Firm Feel, Breathable Airflow Memory Foam, Certified Safe Foams & Fabric, Mattress in A Box](https://m.media-amazon.com/images/I/51ErtSRuHQL._SL1000_.jpg)
![ZINUS 6 Inch Ultima Memory Foam Mattress [New Version], Twin, Fiberglass Free, Medium Firm Feel, Breathable Airflow Memory Foam, Certified Safe Foams & Fabric, Mattress in A Box](https://m.media-amazon.com/images/I/419aJDAKkhL._SL1000_.jpg)
![ZINUS 6 Inch Ultima Memory Foam Mattress [New Version], Twin, Fiberglass Free, Medium Firm Feel, Breathable Airflow Memory Foam, Certified Safe Foams & Fabric, Mattress in A Box](https://m.media-amazon.com/images/I/51M9Kj0Gp3L._SL1000_.jpg)
![ZINUS 6 Inch Ultima Memory Foam Mattress [New Version], Twin, Fiberglass Free, Medium Firm Feel, Breathable Airflow Memory Foam, Certified Safe Foams & Fabric, Mattress in A Box](https://m.media-amazon.com/images/I/41WhFvC6xOL._SL1000_.jpg)
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Lisa Mahan –
This mattress is nice overall. I can definitely understand why some would think it’s too firm, but I find it rather comfortable. It definitely forms to your body and has ample support. Ended up raising to just shy of 8 inches. I will say that after only having it a week or so I noticed that the gray cover had some spots where the threads were running and creating small holes. I also have to comment on the smell. It has taken literally two months for me to not notice the smell consistently anymore. I aired it out for 24 hours initially and then proceeded to unmake the bed and air it out for over another weeks time, and I could STILL smell it. Despite having all of the windows open and the ceiling fan on high every day for 10 hours. But I am happy with the comfort, and I did not find the price to be unreasonable.
Danielle –
Soooo comfortable. Perfect. Great value the price omg. I have it on a day bed in a spare room but i would absolutely get a queen if i needed to replace my current mattress. The box had a funky odor but the mattress has absolutely no smell. It was in plastic and i think the odor was those preservative packets at the bottom of the box. Really happy. Plenty of Support and very comfy.
Aarti –
Item arrived on time. Item is exactly how described. I order this for my 16 year old son as he wanted a bigger bed. It is very comfortable with a medium firm and contours to your body. I was worried that he would be able to feel the road of the bed since it’s only 8 inches thick but nope it’s perfect.
Danielle –
The mattress is very comfortable for an inexpensive mattress. It is worth buying. My kids love it.
Lisa Mahan –
If you’re looking for a quality twin mattress that won’t break the bank but still delivers great sleep, this is it. I bought this mattress for my daughter’s room and cannot believe how comfortable this bed is. It didn’t smell at all and the price is unbelievable for what you’re getting! My son now wants the same one!
Molly –
I couldn’t be happier with this Siena twin mattress! From the very first night, it has been incredibly comfortable. The gel memory foam provides just the right amount of support—medium firm like described—and it gently contours to the body without feeling too soft or sinking in.
I bought it for my daughter’s room, but after trying it out myself, I was honestly tempted to get one for our guest room too! It’s perfect for kids, teens, or even adults who like a supportive yet comfy sleep surface.
The fact that it came in a box and was so easy to set up was a bonus. It expanded quickly, had no strong smell, and was ready to use that same night. For the quality and comfort it offers, the price is unbeatable. You’re getting premium mattress comfort without the premium price tag.
Highly recommend to anyone looking for a budget-friendly mattress that doesn’t compromise on comfort. This one truly exceeded my expectations!
Junejune –
Excellent memory foam mattress. Watch as I was searching for a futon bed mattress and it showed this one. Not exactly what I wanted but good mattress
Amazon Customer –
I really like this mattress. My body is kinda picky when it comes to mattresses, and I was pleasantly surprised with how well I was able to sleep on this mattress from day one. I used it without any bed frame, and that worked well too! It was pretty easy to set up, just had to let it out of the box (I left mine for almost a day to ensure it gets to its max size). So far so good, will be back here to comment on its build when I have used it for a good amount of time.