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Kingsdown Twin Xl High Profile Foundation

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SKU: 50805551

KINGSDOWN Quality Craftsman Since 1904. A blue and white mattress on a bed frame in a modern, well-lit bedroom.
Style + SUBSTANCE. Since 1904, Kingsdown has handcrafted mattresses in the US with superior materials and quality.
Handcrafted Excellence
Handcrafted Excellence

Handcrafted in the United States, our master artisans are committed to better sleep through exceptional craftsmanship.

Finest Materials
Finest Materials

Every square inch of a Kingsdown mattress is handcrafted with superior materials, not just the parts you can see and touch.

Tested and Certificate
Tested and Certificate

Every single mattress is tested and certified before it leaves our hands to ensure consistent quality and accurate support.

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Kingsdown

For over a century, the Kingsdown name has been synonymous with unprecedented quality. Every detail is considered, and we ensure superior material selection and perfection, right down to the last stitch of our renowned tailoring. Since 1904, we’ve never compromised on comfort, and neither should you.

You'll Love Kingsdown

Sleep Cooler
Sleep Cooler

Kingsdown mattresses are designed to help regulate temperature for cooler, more comfortable sleep.

Motion Isolation
Motion Isolation

Individually wrapped coils decrease motion transfer, and select models feature an added buffer that runs the length of the mattress to mitigate partner disturbance.

Highly Rated
Highly Rated

Kingsdown mattresses are highly rated with over 20,000 reviews, averaging 4.7 stars and a 96% referral rate.

Kingsdown foundations are meticulously hand assembled using sustainably sourced Canadian Spruce, which is exceptionally durable. Each piece of lumber is not only heat-treated, but kiln-dried, which improves the performance of the wood over time. Each wooden slat is placed more closely together and cut a full inch wider than most manufacturers to provide a sturdier base.

Collection

Box Spring

Warranty

10 year limited warranty -

Code J -

View Warranty

Color

Black

Pattern

Solid

Profile height

High profile

Upholstery material

Upholstered

Q&A answers generated with AI assistance.

What is the benefit of a high-profile mattress foundation?

A high-profile foundation, like this 9-inch model, is the traditional choice for those looking to add significant height to their sleep set. This is particularly beneficial if you prefer a taller bed that is easier to get in and out of, or if you want to achieve a classic, commanding aesthetic in your bedroom. Additionally, the extra height can provide a more comfortable seating level when you're dressing or relaxing on the edge of the bed.


How should I maintain and clean an upholstered mattress foundation?

Based on our furniture care guidelines, we recommend regular vacuuming with an upholstery attachment to remove dust and allergens from the fabric surface. For minor spills or spots on the solid black upholstery, you should blot the area immediately with a clean, soft cloth and a solution of mild soap and warm water. Avoid using harsh chemicals or saturating the fabric, as this can damage the upholstery and the structural wood underneath.


Can I use this foundation with a memory foam or hybrid mattress?

Yes, this foundation is an ideal partner for memory foam and hybrid mattresses. Based on our expertise, these heavier, more flexible mattress types require a completely flat and rigid support system to perform as designed. The reinforced slat construction of this model provides the necessary "no-flex" support that protects the mattress core and ensures your warranty requirements for a proper support system are met.


Why is kiln-dried Canadian Spruce used in this foundation's construction?

The use of sustainably sourced Canadian Spruce ensures exceptional durability and strength. By kiln-drying and heat-treating the lumber, we remove excess moisture that can lead to warping, splitting, or squeaking over time. This advanced preparation process results in a stable, high-performance frame that maintains its structural integrity much longer than standard untreated wood bases.


How does the slat design of this foundation improve mattress support?

To provide a sturdier and more reliable base, the wooden slats in this foundation are cut a full inch wider than the industry standard and placed closer together. This dense slat configuration creates a more uniform support surface, which is critical for preventing the sagging or "sinking" that can occur with modern mattresses. By minimizing the gaps between slats, the foundation helps extend the lifespan of your mattress and ensures consistent comfort across the entire surface.


Is a Twin XL foundation suitable for a college dorm or a small apartment?

Absolutely. The Twin XL size (80"L x 39"W) is the standard for most college dormitories and is an excellent choice for studio apartments or guest rooms where space is at a premium. Because this foundation is meticulously hand-assembled with durable spruce and features an upholstered finish, it is built to withstand the rigors of frequent moves and the high-traffic lifestyle of a student or urban dweller.

39.00"w x 80.00"d x 8.50"h

4.1 out of 5 stars

Based on 4309 ratings
5
63%
4
11%
3
8%
2
6%
1
12%
Ouch! My neck!

Very Uncomfortable

This review was collected as part of a promotion

While the pillow cooling feature is nice, it unfortunately hurt my neck for several days after using it. Disappointed they cannot be returned.

Review provided by Sealy

Reviewed On Mar 21, 2026
Long term customer, full night sleeper

Perfect for us.

This review was collected as part of a promotion

We have an old Tempurpedic mattress that we love. We were thinking it was about time to get a new one but we didn’t think we could get anything like the original and didn’t know which model to get. Updating felt like a risk. Then I saw the topper. It seemed like a low cost way to experience the current product. We purchased the topper and found it very comfortable. It was the perfect addition to our current Tempurpedic. The fit is great and the straps to hold it in place do a reasonable job. Having a better idea of how the current technology feels, we will probably refresh in the future. But, now with the topper, we don’t have a sense of urgency, nor do we feel a great need. It has proven to be a great addition for us as a retired couple.

Review provided by Sealy

Reviewed On Mar 21, 2026
Bren

Not impressed with the firmness

This review was collected as part of a promotion

Was a little short on the sides, ordered Cal King which is what it is and the sides were short about 2-3 inches on each side.

Review provided by Sealy

Reviewed On Mar 21, 2026
SleepWell

Comfortable and Quality

This review was collected as part of a promotion

Very smooth and cool to the touch every night I jump into bed. Even after many washes it keeps its comfort and coolness.

Review provided by Sealy

Reviewed On Mar 21, 2026
SleepWell

Quality

This review was collected as part of a promotion

Very nice pillow. Definitely shaped to fit the head more naturally. Just a bit of a change for me, a bit of discomfort and I'm still getting used to it.

Review provided by Sealy

Reviewed On Mar 21, 2026