penny.
Diagram illustrating the layers of memory foam in a mattress.
A bedroom scene featuring a full memory foam mattress on a bed.
A mattress in a box shown in a bedroom setting.
Cross-section diagram showing the layers of the memory foam mattress.
Text describing the medium firmness level of the mattress.
Close-up of gel memory foam texture.
A memory foam mattress with an antimicrobial protection badge.
Serta Sheep Dreams mattress with a cloud pattern cover.
Instructions for setting up a mattress-in-a-box.
Diagram showing mattress compatibility with different bed bases.
Serta

Serta Sheep Dreams 12‑in Twin Extra Long Memory Foam Mattress in a Box

$359.99

Available at

wayfair.comBest Price
$359.99
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walmart.com
$429.00
View
lowes.com
$499.00
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Reach your Sheep Dreams with this 12” Gel memory foam mattress! Packed with three layers of foam this mattress delivers optimized sleeping comfort. The 3 inch layer of premium gel-infused memory foam contours to the body for cradling comfort and allows airflow to help you stay cool and comfortable throughout the night. This medium-feel mattress provides best-in-class support with 2” of Serta Transitional Support Foam and 7” of Serta Foam Core. The best part? Serta has been trusted by sleepers for over 90 years and with CertiPUR-US certified foams and a 10-year limited warranty you can be rest-assured that your Serta mattress will always have your back.

  • 12-inch profile
  • Medium feel
  • 3-inch premium gel-infused memory foam for cooling and contouring
  • 2-inch Serta Transitional Support Foam
  • 7-inch Serta Foam Core
  • CertiPUR-US certified foams
  • 10-year limited warranty
  • Antimicrobial cover
  • Packaged in a ready‑to‑unroll box
  • Suitable for most frames and adjustable bases

Details

Category
Memory Foam Mattresses
Firmness
Medium
Mattress Top Type
Tight top
Sleep Position Suitability
Back sleeper, Side sleeper, Stomach sleeper
Recommended Sleep Position
Back, Side, Stomach, Combination
Bedding Size
Twin, Double
Pattern
Solid, Texture
Coil System Type
No coils
Memory Foam Infusion Material
Cooling gel
Mattress Features
Adjustable base compatibility, Anti-microbial, Cooling function, Edge support, Safe non-toxic materials
Materials
Memory Foam, Gel-infused Foam
Age
Adult

Questions & answers

How much does it cost, and where can I buy it?
This Serta memory foam mattress is sold by 3 retailers from $359.99 to $499.00. The lowest in-stock price is $359.99. Available at wayfair.com, walmart.com, and lowes.com.
Is it in stock?
Yes. It's in stock at 3 of 3 retailers.
What are the key features?
Key features include 12-inch profile, Medium feel, 3-inch premium gel-infused memory foam for cooling and contouring, 2-inch Serta Transitional Support Foam, and 7-inch Serta Foam Core.
What is it made of?
It's made of memory foam and gel-infused foam.
What's its coil system type?
Its coil system type is no coils.
What's its firmness?
Its firmness is medium.