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This hour's deals
Sleepy's by Sealy
Sleepy's by Sealy Slumber Firm Twin XL Mattress
−76%
Home · Mattress Firm

A firm twin XL mattress for the guest room, sorted

Sleepy's by Sealy Slumber Firm Twin XL Mattress

Sleepy's by Sealy Slumber Firm Twin XL mattress — a firm feel for guest rooms, dorms and adjustable bases.

Deal score 8.9 · Steal
$279.99$1,149.99 Mattress Firm's regular price

You save $870.00 at Mattress Firm

Deal.ai's agents found this deal on November 8. The store may have changed its price since.

Why it's a great deal

  • Mattress Firm lists its regular price at $1,149.99: 76% off by its own figures
Visit Mattress Firm

Every store we checked

  • Mattress FirmNew

    In stock

    $279.99Observed at 2:52 PM
    Visit Mattress Firm
  • Mattress FirmNew

    In stock

    $279.99Free shippingObserved at 2:52 PM
    Visit Mattress Firm
  • eBayNew

    Availability unknownSold by ma_962110 (100% positive, 3 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $500.00+ $70.41 shippingObserved at 2:52 PM
    Visit eBay

Store links may earn us a commission. Some prices via Klarna.

Price history and every store's price →

Reading Mattress Firm’s product page for the details…

Specs

Product Type
Mattress
Model
Slumber Firm
Mattress Size
Twin XL
Mattress Height
Standard profile
Mattress Comfort Level
Firm
Comfort Description
Supportive,Stable,Not stiff,Consistent feel
Support System
Individually wrapped coil system
Coil Type
Individually wrapped coils
Comfort Layers
Gel foam,Comfort foam
Foam Type
Gel infused foam

About the Sleepy's by Sealy Slumber Firm Twin XL Mattress

The Sleepy's by Sealy Slumber Firm is a twin XL mattress in a box with a tight top, gel foam over comfort foam, and an individually wrapped coil support core. It is built for a firm, stable feel with a supportive edge and quiet coils, and it ships compressed for easy setup. The best new price is $279.99 at Mattress Firm as of November 8, 2026, with three stores listing it new.

Best forShoppers wanting a firm feel at a low priceDorm rooms and guest rooms in a twin XL bedBack and stomach sleepers who prefer firm supportBuyers who want a bed in a box for quick setup
Pros
  • Firm, stable feel that is supportive without being stiff
  • Individually wrapped coils limit motion and run quiet
  • Gel-infused foam adds some cooling over plain foam
  • Supportive perimeter holds up along the edges
  • Ships in a box and sets up fast
Cons

More deals like this

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  • All Mattress Firm deals and prices
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Price facts

  • This deal was $279.99 at Mattress Firm on Nov 8.
  • Lowest price today: $279.99 at Mattress Firm (checked Nov 8, 2026).
  • Checked at 3 stores.

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Firm feel is too hard for many side sleepers
  • Thin comfort layers give limited pressure relief
  • Durability complaints are common at this price
  • Twin XL only suits single sleepers or adjustable bases

    • What reviewers say

    • 3.1 / 5321 ratings

    Ratings average 3.1 out of 5 from 321 ratings, a mixed record. Owners who like a hard bed praise the firm support and easy setup, while others report it feels too hard and wears down sooner than expected.

    What people mention
    • FirmnessMixedSome owners call the firm feel supportive and stable, while others find it too hard to sleep on.
    • DurabilityCriticisedSeveral owners say the foams flatten or the mattress sags within months of use.
    • Pressure reliefCriticisedSide sleepers report shoulder and hip pressure because the comfort layers are thin.
    • Motion transferPraisedThe wrapped coils keep movement from spreading, which helps couples and restless sleepers.
    • SetupPraisedBuyers say it expands quickly from the box and is ready to sleep on the same day.

    Questions and answers

    Is the Slumber Firm good for side sleepers?
    Mostly no. The firm surface and thin gel foam layers leave little cushioning for shoulders and hips, so side sleepers often find it too hard.
    Does it need a box spring?
    No. It works on a platform bed, slatted frame or adjustable base. A box spring is optional and mainly adds height.
    How long does it take to expand after unboxing?
    It is a mattress in a box and typically reaches full shape within a day. Minor odors from the foam usually fade within a few days.
    Is $279.99 a good price for this mattress?
    It is the best new price among the three stores listing it, at Mattress Firm as of November 8, 2026. At that level it is a low-cost firm twin XL, though the 3.1 rating reflects durability complaints.
    What is the difference between the Slumber Firm and a plush model?
    The Firm uses a tight top over gel and comfort foam for a stable, supportive feel. A plush version adds softer foam for more sink and pressure relief.
    Sleepy's by Sealy Skye Hybrid Medium Gel Memory Foam Mattress
  • S
    Sleepy's by Sealy Full Gel Memory Foam Plush Mattress
    Sleepy's by Sealy Full Gel Memory Foam Plush Mattress