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Firm twin XL mattress, ready for the spare room
Sleepy's by Sealy Slumber Firm Twin XL Mattress
Sleepy's by Sealy Slumber Firm Twin XL mattress 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
Checking it's still available…
Why it's a great deal
- Mattress Firm lists its regular price at $1,149.99: 76% off by its own figures
- A deeper cut than 8 in 10 of this hour's 500 deals
Every store we checked
- Mattress FirmNew
In stock
$279.99Observed at 2:52 PM - Mattress FirmNew
In stock
$279.99Free shippingObserved at 2:52 PM - 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
Store links may earn us a commission. Some prices via Klarna.
From Mattress Firm
- Individually wrapped coils reduce motion transfer
- Gel foam layers contour and relieve pressure
- Firm support with gel foam comfort
- Ships in a box for easy setup
- Designed to help regulate body temperature for cooler sleep
- Adjustable base friendly
- Sizes
- Twin XL, Split King
- Materials
- Super Soft Stretch Knit Rayon Cover (rayon fiber); 7/8" gel poly foam in quilt; 1.25" firm foam; 6" Caliber Edge pocketed coils
- Fit
- Firm comfort; Twin XL measures 39" W x 80" L
- Sizing
- Add a second Twin XL mattress in cart to build a Split King set
- Care
- Rotate end-to-end at 2 weeks, then every 2-3 months; use a waterproof mattress protector; carton and transport on its side when moving; do not remove the law ta
- Guarantee
- 10 Year Limited warranty
- Returns
- 120 Night Sleep Trial: if you don't love it, they'll help you find a new one or your money back
- Shipping
- Free shipping; delivery to front door, side door or garage; contactless delivery; no removal of old mattress set
- In the box
- Mattress in a box
What buyers say
Buyers like
- Comfortable and firm, giving the best sleep in a while
- Great for a guest room; guest liked it so much she plans to buy one
- Helpful, kind sales staff
- Good value for the price
- As described
Buyers complain about
- Too thin and way too hard
- Return fee is almost as much as the purchase price
- Mattress never delivered; poor tracking and unhelpful support
- One mattress arrived with dents like a roller coaster
- Too stiff
- Delivery arrived about a month late
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 innerspring mattress sold compressed in a box. It pairs individually wrapped coils with gel-infused and comfort foam layers under a tight knit cover, and it is built for a firm, stable feel rather than a plush one. The best new price is $279.99 at Mattress Firm as of November 8, 2026, and three stores carry it new.
Best forCollege dorm and extra-long twin bedsBack and stomach sleepers who want firm supportGuest rooms and kids' rooms on a budgetShoppers who want a boxed mattress they can set up themselves
Pros
- Firm, consistent feel that stays supportive rather than stiff
- Individually wrapped coils limit motion transfer and run quiet
- Gel-infused foam adds some cooling versus plain foam
- Supportive edge feel for a boxed mattress
- Twin XL size fits dorm and adjustable-bed frames
- Low price for an innerspring at $279.99 at Mattress Firm
