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Extra Firm
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On Sale
Mancini's Sleepworld Granite Bay Extra Firm Mattress 13"-Twin XL
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In Stock
Mancini's Sleepworld Granite Bay Extra Firm Mattress 13"
Why this Mattress?
- Extra firm memory foam holds the spine level all night
- Graphite, Copper, and Titanium foam layers pull heat away
- Super Heavy Weight "Cold" knit cover keeps the surface cool
- Super High-Density base built to hold its shape for years
- Sized for taller sleepers, dorms, and adjustable base setups
Overview
Mancini's Sleepworld Granite Bay Extra Firm Mattress 13" · Twin XL
The Mancini's Sleepworld Granite Bay Extra Firm Mattress 13" is a foam mattress built for the sleeper who needs firm back support and still wakes up feeling the heat from a conventional bed. It puts an extra firm mattress for back pain relief right at the center of its design: a structured memory foam support core loaded with Graphite, Copper, and Titanium sits above a Super High-Density foam base engineered to resist softening over time. The surface never lets the hips sink past neutral, which is exactly what stomach and back sleepers need to keep the lower spine in line. Stop by any Mancini's Sleepworld location and a sleep specialist will place this next to every competing option so you can feel the difference for yourself.
COMFORT AND FEEL: Extra firm all-foam feel with flat, unyielding support that holds the lumbar steady.
SIZE: This Twin XL sized mattress is 38 inches wide by 80 inches long, built for taller single sleepers, college students, and adjustable base configurations.
BEST SLEEP MATCH: Back and stomach sleepers who need firm mattress support will feel the floor-like stability here. The extra firm feel keeps the pelvis from dropping, stopping that morning lower-back ache before it starts.
BEST FOR: Ideal for sleepers who run warm at night, need consistent lumbar support, or wake up stiff from a mattress that has lost its shape.
CONSTRUCTION SPECIFICATIONS: The Super Heavy Weight "Cold" stretch knit quilt panel actively manages surface temperature from the first moment you lie down. Ultra High-Density memory foam layers infused with Graphite, Copper, and Titanium sit beneath the cover, drawing heat away and keeping the feel consistent. The Super High-Density base foam underneath is built to hold firm support for the long term.
SETUP AND COMPATIBILITY: Compatible with adjustable bases, platform frames, and box springs. Arrives rolled and compressed, expands within hours, no tools needed.
NOT A FIT FOR: Side sleepers who need hip and shoulder cushioning, or anyone who prefers a plush or medium feel.
YOUR SLEEP, BACKED BY US
Every Mancini's Sleepworld mattress purchase comes with a 120-night comfort guarantee and our Best Price Guarantee, so you know you paid the right price. Add a premium mattress protector at time of purchase and you can upgrade that guarantee to a full 365 nights. Free next-day delivery and in-home professional setup are included. Flexible financing is available, and you can try before you buy at any Mancini's Sleepworld showroom. Our sleep specialists are here to make sure you get it right.
- SleepMatch: red
Rest Easy Promise
Our promise to you.
- 365-Night Comfort Guarantee with purchase of a premium mattress protector
- Best Price Guarantee Find it lower and we’ll match it.
- Free Next-Day Delivery We’ll deliver to your door, set-up available.
- Double-Your-Warranty We match the manufacturer’s warranty.
Features
- SKU: BRK-GRA-3XM-XF-25
- MPN: 25WI13ALPF_FP33XL
- GTIN: 810191940784
- Brand: Mancini's
- Collection: Sleepworld
- Type: Foam
- Mattress In A Box: No
- Firmness: Extra Firm
- Height: 13
- Length: 80
- Width: 38
- Shipping Height: 13
- Shipping Width: 80
- Shipping Length: 38
- Warranty: 10 Year
- Cover Material: Polyethylene & Poly Blend
- Quilting Layers: Smooth Top
- Comfort Layers: 1'' 4 / 13 Titanium M-Foam,2'' 3.6 / 22 Firm H.D M-Foam
- Support System: 10.0 1.8 / 36 H.D Base Foam
Specification
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Suitable For Adjustable Base: Yes
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Motion Separation: Yes