Oversized Mattresses
Go Beyond King Size with Premium Extra-Large Mattresses Engineered for Deeper Sleep, Long-Term Comfort, and Everyday Support
Sleep Without Limits
Oversized Mattresses Built for Space, Support, and Serious Comfort
When a standard King bed isn’t cutting it, it’s time to size up. Our handcrafted oversized mattresses are made for people who need more room and want better sleep. Whether you’re tall, co-sleeping, or just ready for a luxurious upgrade, these premium foam and hybrid mattresses are designed to support your life.
Each oversized mattress is made to order in the U.S.A. using high-performance CertiPUR-US® certified materials. Choose from two premium models, each available in 5 super king sizes to match your oversized bed frame.
- Grand Slumber Mattress: supportive, breathable, and 100% foam
- Grand Slumber Hybrid Mattress: same comfort with added coils for bounce and airflow
- 5 Oversized Options: Alaskan King, Wyoming King, Texas King, Florida King, and Alberta King
- Compatible with all our oversized bed frames
- Made in the USA with CertiPUR-US® foams
- Ships in 3–4 weeks and arrives ready to unbox
Stop squeezing into a mattress that doesn’t fit. Upgrade your sleep with more room and better support.
Shop Grand Slumber MattressShop Oversized Mattresses
Which Oversized Mattress is Right for You?
Grand Slumber Mattress
A plush all-foam mattress designed for contouring comfort, motion isolation, and deep pressure relief. Great for side sleepers or couples who want a softer, quieter night’s sleep.
Grand Slumber Hybrid Mattress
A supportive hybrid design that combines pressure-relieving foam with inner coils for added lift, airflow, and long-term durability. Ideal for back or stomach sleepers who want structure without stiffness.
Benefits of Our Oversized Mattresses
Every Oversized Mattress we offer is handcrafted to deliver the best possible sleep with no compromises.
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Premium Performance Materials
We use high-density CertiPUR-US® certified foams and premium support cores to ensure long-term comfort and durability. -
Sized to Match Oversized Frames
Available in Alaskan King, Wyoming King, and other extra-large formats. Each one perfectly matched to your custom bed frame. -
Support You Can Feel. Comfort You Can Trust.
Whether you choose all-foam or hybrid, each mattress is engineered for full-body support, pressure relief, and restful alignment. -
Adjustable Firmness, One Mattress
Flip the base layer to fine-tune your feel — softer on the Pink Foam side, firmer on the Support Base side. The topper attaches to either surface, letting you customize your comfort without needing a new mattress. -
Topper Replacement for Long-Term Comfort
Refresh your mattress over time without replacing the entire thing. Our modular design lets you purchase a new topper whenever needed, keeping your sleep experience fresh and extending the life of your mattress. -
Handmade in the U.S.A.
Built to order by skilled American craftsmen.
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American Made
Our mattresses are 100% made in the USA using American materials. We offer discounts for US veterans with proof of military service.
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Safe & Sustainable
All our mattresses are CertiPUR-US® certified. They are made from natural fire retardant materials. The cover is a blend of organic cotton, cashmere, and polyester. We do not use any Ammonium Phosphates or fiberglass.
Additional Information About Our Oversized Mattresses
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The dimensions of our different Oversized Mattress sizes are:
- Wyoming King: 84” x 84”
- Texas King: 80” x 98”
- Alberta King: 96” x 96”
- Florida King: 108” x 80”
- Alaskan King: 108” x 108”
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Our Oversized Mattresses ship independently from our bed frames. Mattresses will be scheduled for delivery within 3-5 business days of your bed. If your mattress is ordered without a bed frame, it ships out immediately.
Oversized Mattresses are delivered in three (3) separate boxes.
Mattresses are not delivered by our White Glove Delivery partners. If you order White Glove Delivery for your bed frame, your mattress will still arrive on its own.
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We designed our bed frames so that you will not need to use a box spring to support your mattress. The mattress rests on durable 2x4 and 2x8 wooden slats. We recommend placing a solid surface between a memory foam mattress and the wooden slats. All our mattresses ordered with a bed frame automatically ship with a ⅛” masonite board. This keeps the foam-based mattress from sinking between the slats over time.
Buy Now. Pay Later.
Pay over time* for as low as 0% APR for 12 months
We offer financing options to help you purchase your new bed today. Pay for your bed in monthly installments over 12, 24, or 36 months with competitive interest rates, including 0% APR* for 12 months. Apply now to see if you pre-qualify with our fast, streamlined online application.
Learn More*Availability of terms may vary based on purchase price and/or product. Down payment may be required. Subject to approval of credit application. Rates range from 0% to 29.99% APR, resulting in, for example, 36 monthly payments of $32.26 at 9.99% APR, per $1,000 borrowed. APRs will vary depending on credit qualifications, loan amount, and term. Bread Pay™ loans are made by Comenity Capital Bank, a Bread Financial™ company.