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Siena

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

  • Based on 695 reviews
Condition: New
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$199.00 Why this price?
Save $130.00 was $329.00

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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Jul 19
Order within 6 hours and 22 minutes
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Size: King


Style: 8” Memory Foam


Pattern Name: Mattress


Features

  • 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 theres 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 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.
  • 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

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.

Brand: Siena


Size: King


Product Dimensions: 80"L x 76"W x 8"Th


Top Style: Gel Top


Cover Material: Polyester Blend


Number of Layers: 4


Fill Material: Gel Memory Foam, Memory Foam


Special Feature: Pressure-Relieving Gel Memory Foam, CertiPUR-US® Certified, Simple to Set Up, Medium Firm, Breathable See more


Color: White


Model Name: Siena


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


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jul 19

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Incredibly Comfortable and an Amazing Value!
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
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! ... show more
Reviewed in the United States on June 29, 2025 by Molly
    • Extremely comfortable and the price is unbelievable!
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
Review Image by Lisa Mahan 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! ... show more
Reviewed in the United States on June 30, 2025 by Lisa Mahan Lisa Mahan
    • Good overall
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
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. ... show more
Reviewed in the United States on May 2, 2025 by Amazon Customer
    • Great mattress for this price!
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
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. ... show more
Reviewed in the United States on June 9, 2025 by Aarti
    • Great mattress for a great price.
Size: Full Style: 8” Memory Foam Pattern Name: Mattress
Review Image by Danielle Danielle
Review Image by Danielle Danielle
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. ... show more
Reviewed in the United States on June 21, 2025 by Danielle Danielle
    • Great mattress for the price
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
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. ... show more
Reviewed in the United States on June 2, 2025 by Junejune
    • Comfortable soft mattress
Size: Twin Style: 8” Memory Foam Pattern Name: Mattress
The mattress is very comfortable for an inexpensive mattress. It is worth buying. My kids love it.
Reviewed in the United States on June 29, 2025 by T
    • Not a futon mattress
Size: Full Style: 8” Memory Foam Pattern Name: Mattress
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
Reviewed in the United States on June 16, 2025 by Robert Cho

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