Siena 8” 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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Size: King
Style: 8" Essential
Pattern Name: Memory Foam
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.
- MEMORY FOAM - A 1.5" layer of pressure relieving 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
Item Weight: 55 Pounds
Item Firmness Description: Medium Firm
Top Style: Gel Top
Cover Material: Polyester Blend
Number of Layers: 4
Fill Material: Gel Memory Foam, Memory Foam
Weight Limit: 800 Pounds
Product Dimensions: 80 x 76 x 8 inches
Item Weight: 55 pounds
Manufacturer: Siena Mattress
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
Age Range Description: Adult
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
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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Top Amazon Reviews
Size: Twin
Style: 8" Essential
Pattern Name: Memory Foam
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!
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Reviewed in the United States on June 29, 2025 by Molly
Size: Full
Style: 8" Essential
Pattern Name: Memory Foam
In a sea of off-label mattress brands on Amazon, I was so happy they carried Siena mattresses, and my back definitely thanked me for it! This mattress is a bit on the softer side, but the memory foam provides a lot of support and cushion to the back while being very comfortable. I’ve been using mine for about a year with no issues or complaints, and my guests have all really liked this mattress as well! I loved how this mattress was delivered right to my front door in a box, and super easy to unpackage and set up in just a few hours!
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Reviewed in the United States on December 31, 2025 by Lucia Lucia
Size: Full
Style: 6" Essential
Pattern Name: Memory Foam
Bought this to replace cushions in our tiny home on wheels main bed that doubles as a couch. I was worried it'd be too thick and heavy to fold like a futon, but I have been very pleasantly surprised: it's easier to transition than the cushions that came with the rv. It's wayy more comfortable, lighter yet firm and soft? I am very pleased for the price, quality, shipping, packaging and assembly. Hence 5 stars. Would recommend.
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Reviewed in the United States on November 28, 2025 by Alana Antares Alana Antares
Size: Full
Style: 6" Essential
Pattern Name: Memory Foam
We bought this 6” full foam mattress for our child’s bed, and it turned out to be a great choice for the price. While it’s not the highest-end mattress out there, it’s exactly what we needed - a low-profile, comfortable, and affordable option for a kid's room. What we liked: The 6” height was perfect for our bed frame, especially since we needed a low-profile setup for safety and style. It arrived quickly, expanded well out of the box, and didn’t have any strong chemical smell. It’s comfortable enough for a child or as a guest mattress Excellent value for the price. You don’t always need a luxury mattress, especially for younger kids or occasional use. Things to know: As expected, it's not super plush or high-end. Adults might find it too thin for long-term use. It’s a simple foam construction, so no extra cooling layers or edge support but for a child, that’s not really a concern. Overall: If you’re looking for a budget-friendly, low-profile mattress for a child, bunk bed, trundle, or daybed, this is a great pick. It’s comfortable, affordable, and fit our needs perfectly.
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Reviewed in the United States on October 21, 2025 by Kels Kels
Size: Twin XL
Style: 8" Essential
Pattern Name: Memory Foam
Bought for top bunk. It fits well and is comfortable.
Reviewed in the United States on December 21, 2025 by BP
Size: Twin
Style: 8" Essential
Pattern Name: Memory Foam
Do not and I repeat do not buy this bed for your kids. My kids needed new beds bad so I bought 2 of these cause they were on sale for a nice price. That was my first mistake. I have not seen my kids since I bought them and we put them in their rooms. All they do is sleep. They call them coma beds. Said they are so comfortable they don't want to leave them.. Second mistake I'm getting me a queen size in Jan with next check lol. They claim best sleep ever, but I will be the judge of that.
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Reviewed in the United States on December 28, 2025 by Jessica
Size: Twin
Style: 8" Essential
Pattern Name: Memory Foam
For under 100$ it’s work-with-able. My kids are under 5 so firm is ok, these are very firm btw. Like you landed on soft concrete. Not a lot of give. Not thick either. But comfortable enough for like a5 year mattress at most.
Reviewed in the United States on December 14, 2025 by brittnyschwartz
Size: Full
Style: 8" Essential
Pattern Name: Memory Foam
Awesome mattress at an affordable price. Delivered to your door and pop it open in your room simple
Reviewed in the United States on December 27, 2025 by Halfsockz