Size: Twin  • Comfort level: Medium
Construction: All-foam mattress without innerspring coils
Comfort layer: 2" body-contouring memory foam
Support core: 10" firm support foam
Cover: Stretch knit fabric
Compatibility: Adjustable-base compatible
Weight: 45 lbs. (Twin)
Foundation/box spring: Sold separately
Setup: Ships compressed in a box; allow up to 48 hours for expansion
Warranty: 10-year non-prorated manufacturer warranty
Available sizes: Twin and California King
SKU: M59311
Why choose the Ashley Sleep 12-Inch Memory Foam Twin Mattress M59311?
The Ashley M59311 combines 2 inches of contouring memory foam with a substantially thicker 10-inch firm support-foam core, creating a medium-rated sleeping surface without traditional springs. The upper layer provides cushioning, while the underlying foam supplies resistance and helps absorb movement. Its approximately 38-by-74-inch Twin footprint suits single-sleeper bedrooms where preserving floor space matters. At 12 inches thick, this mattress also requires attention to finished bed height and fitted-sheet depth, especially when replacing a thinner mattress. Adjustable-base compatibility provides additional setup flexibility. A California King option is available for different room and sleeping-space requirements, with its own size-specific SKU.
Specificationsâ–¶
Specifications Details
Brand Name
Sierra Sleep® by Ashley
Material
Fabric
Lifestyle
Traditional
Bed Size
Twin
Pattern
Textured
Mattress Feature
Memory Foam
Assembly
Assembly Not Required
Product Detailsâ–¶
Comfort level: medium
12" profile height
2" memory foam
10" firm support foam
Stretch knit cover
Adjustable base compatible
10-year non-prorated warranty
Note: Purchasing mattress and foundation from two different brands may void warranty; see warranty for details
Foundation/box spring sold separately
State recycling fee may apply
Mattress ships in a box; please allow 48 hours for your mattress to fully expand after opening
Availabilityâ–¶
Available Configurations
SKU M59311 — Twin Dimensions: 74.41''W x 37.99''D x 12''H | Weight: 36.73 lbs▶
This option is a Twin Mattress.
SKU M59351 — California King Dimensions: 83.5''W x 72''D x 12''H | Weight: 75.34 lbs▶
This option is a California King Mattress.
How does the 2-inch memory foam layer affect the feel of the Ashley 12-Inch Memory Foam Twin M59311?
The Ashley M59311 combines 2 inches of contouring memory foam over 10 inches of firm support foam. The upper layer cushions the body, while the thicker core provides resistance to deeper compression. Although the underlying foam is firm, Ashley rates the overall mattress as medium. This distinction between surface cushioning and underlying mattress firmness is important for shoppers who want foam comfort without assuming the mattress has an ultra-soft feel. Individual comfort varies with body weight and sleeping position.
Is the Ashley 12-Inch Memory Foam M59311 Twin mattress suitable for a small bedroom or guest room?
Measuring 37.99 inches wide and 74.41 inches long, the Ashley M59311 provides a single-sleeper surface while leaving more room for furniture than larger mattress sizes. Its compact footprint can work particularly well in guest rooms or bedrooms shared with a desk or dresser. When comparing Twin, Twin XL and Full mattress dimensions, remember that Twin XL typically adds 5 inches of length, while Full provides approximately 16 inches of additional width. M59311 is the Twin version; the separately listed California King is a different size and requires its own frame and bedding.
Can the 12-inch Ashley Memory Foam Twin M59311 use an adjustable base, and how should I prepare for setup?
Yes. Ashley lists the M59311 as adjustable-base compatible. Its 12-inch thickness produces an approximate mattress-top height of 24 inches when placed on a support surface 12 inches above the floor, before compression. Choosing between an adjustable bed and a conventional stationary frame affects positioning flexibility, support requirements and finished height. Confirm that the base accommodates the Twin dimensions and meets the manufacturer's requirements. The 45-pound mattress arrives compressed in a box; allow up to 48 hours for expansion after opening. A foundation or box spring is sold separately.
Shopping for the Ashley 12-Inch Memory Foam Twin Mattress M59311 in Chicago or Illinois? VBU Furniture offers convenient Chicagoland pickup, delivery throughout Chicago and Illinois, and nationwide shipping across the contiguous 48 states.
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