12 Inch Memory Foam Mattress

$361.79 ~~$1029.99~~ In stock

When it comes to your comfort, discover this ultra-plush 12-inch mattress. Its thick layer of memory foam conforms to your body delivering amazing support, pressure relief and comfort. The memory foam layer is paired with a super-thick layer of firm support foam, which helps reduce motion transfer so you and your partner can enjoy an undisturbed sleep. This mattress arrives in a box for easy setup. Foundation/box spring available, sold separately.

Specifications

Specifications Details

Brand Name

Sierra SleepÂ¨ by Ashley

Material

Fabric

Lifestyle

Traditional

Assembly

Assembly Not Required

Product Details

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

Available Options

Available Bed Sizes

Twin | California King

Available Colors

Color Options

White

Available Configurations

Bed Size

SKU #

Dimensions

Weight

Twin

M59311

38''W x 74''D x 12''H

36.73 lbs.

California King

M59351

72''W x 84''D x 12''H

75.34 lbs.

Before you pay

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When it ships

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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If you need a refund

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 4 reviews)

Evelyn ★★★★★ Oct 20, 2026

Woke up without the usual stiffness in my lower back for the first time in weeks, and that thick memory foam layer really does mold around your hips and shoulders. Pressure relief is exactly what I was hoping for—sleeping on my side feels like floating now.

Lily A. ★★★★★ Oct 18, 2026

I’ve had this mattress for a couple of weeks now, and my back pain is noticeably better each morning. The thick memory foam layer really does conform to your body without making you feel stuck. It’s surprisingly firm where it needs to be but still plush enough to sink into slightly.

Charlotte ★★★★★ Oct 18, 2026

I was a little skeptical about foam mattresses, but this one really surprised me. The thick memory foam layer conforms perfectly to my hips and shoulders, and I’ve been waking up without any back pain for the first time in months.