Stearns & Foster SX Box Spring Foundation
Best foundational support for those looking to extend their mattress lifespan.
Enhance your mattress's lifespan and comfort with the Stearns & Foster SX Box Spring Foundation. Engineered for superior foundational support, it effectively absorbs shock, protecting your mattress from premature wear. Its sleek, modern design complements any bedroom decor. Available in Queen size, this foundation offers a choice between a standard 5-inch profile or a low-profile option to suit your bed height preferences. It's an essential component for maintaining the integrity and performance of your high-quality mattress.
$240.00
Owner Satisfaction
4.6
/ 5
Category Rank
55
/ 834
#55 in Mattress Foundations
Price vs Category Average
-79%
Below average
Size
6080
/ ” W x ” L (Queen)
Who it's for
- Buyers wanting to ensure full manufacturer warranty coverage
- Decorators needing specific bed heights for aesthetic or accessibility goals
- Owners seeking maximum longevity for their premium mattress investment
Who should skip it
- Residents in homes with narrow hallways or tight staircases
- Sleepers requiring ergonomic head or foot elevation adjustments
- Budget-conscious shoppers looking for affordable third-party alternatives
Performance breakdown
Structural Integrity
Robust construction ensures long-term stability for high-end mattress investments.
Shock Absorption
Engineered to dampen motion and protect mattress coils from premature fatigue.
Profile Versatility
Dual height options allow for precise customization of your bed's elevation.
Setup Convenience
Arrives fully assembled, eliminating the frustration of complex home construction.
Aesthetic Integration
Clean, modern lines ensure it disappears seamlessly beneath any mattress.
Surface Uniformity
Provides a perfectly flat, consistent plane to prevent mattress sagging.
Key Specs
Size
60” W x 80” L (Queen)
Standard Height
5 inches
Available Profiles
Standard and Low
Foundation Type
Box Spring
Assembly Required
False
Split Design
False
Includes Legs
False
Features
- Absorbs shock for mattress longevity
- Provides exceptional foundational support
- Modern design aesthetic
- Available in multiple sizes
- Choice of Standard or Low Profile height
- Enhances mattress performance and comfort
What customers say
Customers highly value the exceptional quality and robust reliability of the SX foundation. Its superior construction offers firm support, ideal for high end mattresses, preventing sagging and extending the life of your sleep system. While the price is a consideration, the foundation's durability and long term performance provide confidence, making it a worthwhile investment for a trustworthy bedroom setup. This essential component ensures your mattress maintains its integrity.
Know before you buy
The primary difference is the height of the foundation. The standard profile is 5 inches tall, while the low-profile option is designed for those who prefer a lower bed height or have a thicker mattress that they do not want to sit too high off the ground.
No, this foundation is a single, solid piece. Please ensure that your hallways, stairwells, and bedroom doorways can accommodate a 60-inch by 80-inch piece before ordering.
No, this product is the box spring foundation only. It is designed to be placed inside an existing bed frame or on top of a platform bed that requires a foundation.
No, the Stearns & Foster SX Box Spring arrives fully assembled and ready to use. You simply need to place it onto your bed frame.
A high-quality foundation acts as a shock absorber, which helps distribute your weight evenly and prevents the mattress from sagging. Using a compatible foundation is essential for maintaining your mattress's structural integrity and ensuring it performs as intended over time.
Still have a question?
Ask Hayley anything about this product before you decide.