Twin Ashley Sierra Sleep Sierra 6 Inch Firm Bed in a Box Mattress

Twin Ashley Sierra Sleep Sierra 6 Inch Firm Bed in a Box Mattress

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Sale Ends September 27th

120 Night In-Home Trial

From $149.00

To $268.00




Reg: $289.00 You save $90.00!
Reg: $219.00 You save $70.00!
Reg: $259.00 You save $80.00!
$33.17/mo suggested payments with 6 months special financing.
$29.83/mo suggested payments with 6 months special financing.
Customize Twin Ashley Sierra Sleep Sierra 6 Inch Firm Bed in a Box Mattress

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Twin Ashley Sierra Sleep Sierra 6 Inch Firm Bed in a Box Mattress
Twin Ashley Sierra Sleep Sierra 6 Inch Firm Bed in a Box Mattress

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Expert Review

Expert Review by Jed
The Ashley Sierra Sleep Sierra Firm mattress is a good choice if you're looking to keep your cost as low as possible. This mattress doesn't contain any of the higher end features, like memory foam, found in other models, but for a temporary situation, it should work well. A 1 inch layer of high density comfort foam provides a firm overall feel, while the Bonnell Coil System provides support to the lower back. This mattress is designed to provide comfort for short durations, or sporadic use, and carries a 1 year warranty.


Comfort This describes how a mattress feels. The Comfort Scale rating is based on how the cushioning materials conform to the body's shape. The higher the number the softer the mattress.

  • Firm

Quilt - Top of Mattress This is the outside cover on the top of the mattress. It covers and protects the comfort and support layers inside.

  • Poly Quilt

Comfort - Padding Layers This provides a cushioning layer between you and the support system in the bed. Different kinds of padding will provide different levels of comfort.

Correct Back Support System This is a general term used to describe how a mattress distributes and stabilizes body weight and maintains proper spinal alignment. Different materials provide different levels of support.

Box Spring - Foundation (optional)

Warranty This tells you what kind of warranty you have and how long it will last. A typical warranty lasts about 10 years.

  • 1 Year Limited Warranty


  • MATT-931293, FDN-929643


Queen6"60"80"35.45 lbs.
Twin6"38"75"35.45 lbs.
Full6"54"75"35.45 lbs.
SizeCoil Count

Works With Most Bed Types

Box Spring
Box Spring
Traditional Frames
Traditional Frames

Your mattress purchase is fully compatible with most modern support systems, platform bed, box spring/foundation, even the floor! Not recommended with adjustable base.

Why Buy from US-Mattress

Delivery Info


Our contactless delivery helps keep you and delivery personnel safe!

  • Your mattress order ships free via UPS/FedEx ground right to your front door
  • You can expect delivery in 2 to 3 weeks
  • No signature necessary - our drivers take a photo of the product for Proof of Delivery

Please note that furniture and bedding deliver separately from your mattress order. Remote locations can experience longer lead times.

California Residents: This product complies with state regulations including mattress removal. Learn more

Let Us Help You
Pick the Right


  • Sleep cooler through the night with DualCool Technology
  • Feel supported with 900 Series Pocketed Coils
  • Consistent comfort with the BeautyEdge Foam Encased Edge