Siena 8” Cal King Gel Memory Foam Mattress - Medium Firm - 180 Night Trial - Premium Pressure-Relieving Layers - 10 Year Manufacturer Warranty - CertiPUR-US® Certified
Siena 8” Cal King Gel Memory Foam Mattress - Medium Firm - 180 Night Trial - Premium Pressure-Relieving Layers - 10 Year Manufacturer Warranty - CertiPUR-US® Certified
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Siena

Siena 8” Cal King Gel Memory Foam Mattress - Medium Firm - 180 Night Trial - Premium Pressure-Relieving Layers - 10 Year Manufacturer Warranty - CertiPUR-US® Certified

197 ratings
Siena 8” Cal King Gel Memory Foam Mattress - Medium Firm - 180 Night Trial - Premium Pressure-Relieving Layers - 10 Year Manufacturer Warranty - CertiPUR-US® CertifiedSiena 8 Cal King Gel Memory Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CerSiena 8 Full Gel Memory Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CertifiSiena 6 Twin XL Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Warranty CertiPUR US CertifiedSiena 6 Essential Hybrid Twin Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 Queen Gel Memory Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CertifSiena 8 Essential Hybrid Twin XL Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 King Gel Memory Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CertifiSiena 6 Essential Hybrid Full Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 Essential Hybrid Full Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 Twin Medium Firm Tight Top Memory Foam MattressSiena 6 Queen Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Warranty CertiPUR US CertifiedSiena 6 Essential Hybrid Queen Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 6 King Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Warranty CertiPUR US CertifiedSiena 8 Essential Hybrid California King Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress BoxSiena 6 Essential Hybrid King Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 6 Full Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Warranty CertiPUR US CertifiedSiena 6 Essential Hybrid Twin XL Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 6 Essential Hybrid California King Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress BoxSiena 8 Essential Hybrid King Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 Essential Hybrid Twin Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 8 Essential Hybrid Queen Mattress Medium Firm Memory Foam Innerspring System 180 Night Trial Pressure Relief Mattress in a BoxSiena 6 California King Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CertifiSiena 8 Twin XL Gel Memory Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US CertSiena 6 Twin Foam Mattress Medium Firm 180 Night Trial Premium Pressure Relieving Layers 10 Year Manufacturer Warranty CertiPUR US Certified
Bed SizeCalifornia King
MaterialMemory Foam
Mattress Thickness8 in

Key item 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 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.
  • MEDIUM FIRM AND SUPPORTIVE - Finding the perfect firmness is a breeze with the 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.

Specs

Bed size, California KingMattress comfort level, MediumMattress type, Memory Foam MattressesFeatures, Mattress-in-a-Box, Cooling Technology, Low Motion Transfer, Breathable ConstructionMattress thickness, 8 inBrand, Siena

About this item

Product details

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.
  • 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.
  • MEDIUM FIRM AND SUPPORTIVE - Finding the perfect firmness is a breeze with the 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.
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Specifications

Bed size

California King

Mattress comfort level

Medium

Mattress type

Memory Foam Mattresses

Features

Mattress-in-a-Box, Cooling Technology, Low Motion Transfer, Breathable Construction

Warranty

Warranty information

10 Year Manufacturer Warranty

Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.

Customer ratings & reviews

4.5 out of 5 stars
stars
197 ratings108 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars79% (155)
  2. 4 stars8% (15)
  3. 3 stars5% (9)
  4. 2 stars4% (8)
  5. 1 star5% (10)

Reviews summary

Pros

  • : Offers a balanced blend of cushioning and stability.
  • : Offers a good mattress at this price point.
  • : The mattress promotes restful nights and reduces back pain.
  • : Assembly and initial use are quick and complete in little time.

Neutral

  • : Firmness varies, ranging from comfortable to too soft or squishy.
Generated by AI
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Showing 1-3 of 108 reviews

Oct 18, 2026
Reviewer name: Thach N.
5 out of 5 stars
5 out of 5 stars review

This 8 in essential memory

This 8 in essential memory foam mattress has very good support for back sleeper that can rival much more expensive hybrid mattresses. It is a little firm for side sleeper.

Review from Siena
Helpful?6AKHSQMV6OI016666770410
Oct 18, 2026
Reviewer name: Ines B.
5 out of 5 stars
5 out of 5 stars review

Great mattress and bed. It

Great mattress and bed. It was easy to put together too! Happy customer.

Review from Siena
Helpful?6AKHSQMV6OI016666770410
Oct 8, 2026
Reviewer name: Irelyne G.
5 out of 5 stars
5 out of 5 stars review

I finally was able to

I finally was able to afford to get myself a bed and bedframe. I chose this mattress because of the quality and the sale going on. It was the bed thing I have ever done. It's so comfortable I have a hard time getting out of bed sometimes. I have a horrible spine (lower back mostly and some mid) and neck. I get flare ups and this bed helps.

Review from Siena
Helpful?6AKHSQMV6OI016666770410
Current price is $349.00
Price when purchased online
  • Free shipping
  • Free 90-day returns
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Arrives by Thu, Nov 19
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Sold and shipped by ResidentPro Seller
4.475 out of 5 stars
4.5 stars out of 5, based on 40 seller reviews(4.5)
Free 90-day returns