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Premium RTA Mattress Foundation
Solid White Pine. Organic Cotton & Wool Cover. Made in the USA.
Starting at $485
SHOP FOUNDATION
Latex Mattress Foundation
Free Shipping Anywhere in The Continental USA.
Starting at $535.00 $485.00
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Our foundation is overbuilt to ensure you get the support needed for your latex mattress. 3 slats provide optimal support and air flow. Covered in our matching 100% organic cotton and wool cover.
Description
Free Shipping
Continental USA via UPS
Made in the USA
Premium white pine
Built to Last
Solid wood construction
Free of Harmful Chemicals
No glues or formaldehyde
Built to Last
The Latex Mattress Foundation Your Bed Deserves
A natural latex mattress can weigh over 170 pounds. Most foundations aren’t designed for that kind of weight. Ours is. Every slat is solid, untreated premium white pine with no more than 2.5 inches of spacing, providing uniform support that prevents sagging and extends the life of your mattress. The cotton-and-wool cover keeps everything clean and free of harmful chemicals. No particle board. No cheap staples. No toxic flame retardants. Just real wood, real fabric, and a foundation that does its job for decades.
Premium Solid Wood Mattress Foundation
- 100% untreated S4S premium white pine: no particle board or plywood
- 13–14 slats with 2.5″ spacing: ideal support for heavy latex mattresses
- Organic cotton & wool cover: no chemical flame retardants
- 8″ standard profile: the traditional box-spring height, and the only height this foundation is built in
- Optional wood bed legs: add legs in the builder when you want a freestanding setup
- Frame compatible: works with any standard metal bed frame or furniture system
- Assembles in under 45 minutes: ships via UPS in one box
Foundation vs. Box Spring
Box springs were designed for innerspring mattresses. Your latex mattress needs something better.
| Feature | Our Foundation | Box Spring |
|---|---|---|
| Mattress Support | ✓ Solid slats, no sagging | ✗ Springs compress over time |
| Weight Capacity | ✓ Built for 170+ lb latex | ✗ Designed for lighter innersprings |
| Airflow | ✓ Open slat design | ✗ Enclosed fabric traps moisture |
| Chemicals | ✓ Zero, no glue, no FR | ✗ Adhesives & flame retardants |
| Durability | ✓ Solid wood lasts decades | ✗ Springs fail in 5–8 years |
| Assembly | ✓ RTA, ships flat, easy setup | ✗ Bulky, hard to move |
★★★★★
Solid & Well Made
This foundation is incredibly solid. Assembly was straightforward and it supports our heavy latex mattress perfectly. No creaking, no wobble. Exactly what we needed.
★★★★★
Perfect Match for Our Mattress
We bought this with our Sleeping Organic mattress and it’s the perfect pair. The slat spacing is ideal for latex, and I love that there are no harmful chemicals. Very happy with the quality.
Choose Your Size
Available in every standard mattress size, built in our classic 8″ standard profile.
Need a Lower Profile?
5.5″
The 5.5″ low profile is now exclusive to our Heavy-Duty Mattress Foundation, which pairs the lower height with a reinforced frame. Ideal for platform beds, tall side rails, and kids’ rooms.
Standard Profile
8″
Traditional height that fits most bed frames and makes it easier to get in and out of bed. Every Premium RTA foundation is built at this height.
| Size | Dimensions | Shipping Box | Weight | Price |
|---|---|---|---|---|
| Twin | 37.5″ × 74.5″ | 70 × 13 × 12″ | ~55 lbs | $535 |
| Twin XL | 37.5″ × 79.5″ | 70 × 13 × 12″ | ~60 lbs | $545 |
| Full | 52.5″ × 73.5″ | 77 × 13 × 12″ | ~65 lbs | $590 |
| Queen | 59.5″ × 79.5″ | 77 × 13 × 12″ | ~75 lbs | $645 |
| King | 75.5″ × 79.5″ | 2 × Twin XL boxes | ~120 lbs | $915 |
| Cal King | 71.5″ × 83.5″ | 77 × 13 × 12″ | ~80 lbs | $915 |
*Listed dimensions are the actual vendor-provided foundation dimensions. Cal King split sections measure 35.5″ × 83.5″ each.
What It’s Made Of
Three simple, honest materials. Nothing else.
Premium White Pine
S4S (surfaced 4 sides) untreated euro white pine. No particle board, no plywood, no MDF. Just real, solid wood.
Organic Cotton
The outer cover is made from natural cotton. Breathable, durable, and free of pesticide residues.
Eco-Wool
Quilted into the cover as a natural flame barrier. No chemical flame retardants needed, just wool doing what wool does.
Easy Assembly
Set Up in Under 45 Minutes
Our RTA (ready to assemble) foundation ships flat in a compact UPS box, no freight truck, no special delivery. Everything you need is in the box. Slide the slats into place, secure the frame, and you’re done. Two people make it easier, but it’s simple enough for one. Solid, stable, and ready for your mattress.
Optional Add-On
Solid Wood Bed Legs
Elevate your foundation with 5″ tapered solid wood legs and brass ferrules. Adds clearance for under-bed storage and gives your setup a finished, modern look. Easy screw-in installation, no tools required.
- Solid hardwood with brass ferrule feet, 5″ height
- Screw-in installation, no tools needed
- Adds 5″ of clearance for under-bed storage
- Available for all sizes, select in the builder above
Why Your Latex Mattress Foundation Matters
The wrong base can void your warranty, cause premature sagging, and trap moisture under your mattress.
Proper Support
Latex mattresses are heavier than conventional mattresses. Slats spaced more than 3″ apart let the latex sag between gaps, creating pressure points and shortening mattress life.
Airflow
Natural latex breathes, but only if air can circulate beneath it. Our open slat design promotes airflow that keeps your mattress dry and fresh year after year.
Warranty Protection
Many mattress warranties require a proper foundation with slats no more than 3″ apart. Our foundation is designed to meet that standard.
Our Promise
We stand behind every foundation we build.
Factory-Direct Pricing
No showrooms, no retail markups. We build and sell direct so you get a premium foundation at a fair price.
Free Shipping
Ships free via UPS Ground to the continental United States. Compact box fits through any door.
Quality Guarantee
Built from solid premium white pine, not particle board or plywood. If it arrives damaged, we’ll replace it immediately.
Complete Your Sleep Setup
Pair your foundation with our organic mattress and accessories for a fully natural sleep environment.
Custom Natural Latex Mattress
Starting at $899
Choose your firmness layer by layer. Split configurations available for couples at no extra charge. 100% natural Dunlop & Talalay latex.
Build Your Mattress →
Natural Latex TopperAdd a pillow-top feel outside the cover. Same 100% natural latex. Available in every firmness level.
Shop Topper
Frequently Asked Questions
Everything you need to know about our Premium RTA Mattress Foundation.
Foundation Basics
Do I need a foundation for my latex mattress?
A proper foundation isn’t just recommended, it’s essential. Natural latex mattresses are significantly heavier than conventional mattresses (a Queen can weigh over 100 lbs). A foundation with closely spaced slats (3″ or less) provides the uniform support that prevents sagging and extends your mattress life.If you already have a platform bed or slatted base with slats no more than 3″ apart, you may not need a separate foundation. But if your current setup has wider gaps, a box spring, or no slat support, upgrading to a proper foundation is the single best thing you can do for your mattress.
Do you offer a low-profile height?
The Premium RTA foundation comes in our classic 8″ standard profile, the traditional height that works with most bed frames. If you’re replacing a standard box spring, this is the right choice.If you want a lower sleep surface, for a platform bed, tall side rails, or a kids’ room, our Heavy-Duty Mattress Foundation is available in a 5.5″ low profile as well as the 8″ standard, and adds a reinforced frame rated for heavier sleep systems.
Will this foundation work with my existing bed frame?
Yes. Our foundation is designed to fit any standard bed frame, just like a box spring would. It works with:
- Metal bed frames: the most common setup
- Wooden bed frames: with or without a center support
- Platform beds: the low-profile 5″ option is ideal
- Adjustable bases: not compatible; use the base on its own
Can I use this foundation with a non-latex mattress?
Absolutely. While we designed it with heavy latex mattresses in mind, it works beautifully with any mattress type, memory foam, hybrid, innerspring, or pocketed coil. The solid slat construction provides better support than a box spring for any mattress.
Assembly & Shipping
How long does assembly take?
Most customers complete assembly in 30–45 minutes. The foundation ships flat in a compact box with all hardware included. You’ll slide the slats into place and secure the frame, no special tools required beyond what’s in the box. Two people make it faster, but one person can handle it.
How does shipping work?
We ship free via UPS Ground to the continental United States. The foundation arrives in a compact box:
- Twin/Twin XL: 70 × 13 × 12″ box
- Full/Queen/Cal King: 77 × 13 × 12″ box
- King: Two Twin XL boxes (two Twin XL foundations make up a King)
What if my foundation arrives damaged?
Contact us immediately and we’ll ship a replacement at no cost. We package each foundation carefully to prevent shipping damage, but UPS handles millions of packages, occasionally things happen. We’ll make it right.
Materials & Care
What kind of wood is used?
We use 100% untreated S4S (surfaced 4 sides) premium euro white pine. This is real, solid wood, not particle board, plywood, or MDF. White pine is naturally strong, lightweight relative to its strength, and does not require chemical treatments to perform well indoors.
Why cotton and wool instead of synthetic fabric?
The cotton-and-wool cover serves two purposes: it protects the wood and acts as a natural flame barrier. Wool is naturally flame resistant, it chars rather than melts or catches fire. This means we don’t need to spray the foundation with chemical flame retardants (which most conventional foundations use). The result is a cleaner, healthier product in your bedroom.
How do I care for my foundation?
Very little maintenance is needed. The foundation goes inside your bed frame and under your mattress, so it stays clean. If you ever need to clean the cover, spot-clean with a damp cloth. Avoid soaking the wood. When moving, disassemble and re-pack, the RTA design makes it easy to move to a new home.
Real Materials Matter
A Mattress Foundation as Natural as Your Latex Bed
You chose an organic mattress because you care about what’s in your bedroom. Your foundation should meet the same standard. Solid wood. Organic fabric. Zero chemicals. From the ground up, your sleep is clean.
Ready to Build Your Foundation?
Starting at $485. Free shipping. Ships in 2–4 business days.
SHOP NOWQuestions? Call (800) 625-4042 or email us
Want the Full Breakdown?
The Complete Guide to Latex Mattresses
Nearly two decades of organic mattress experience, distilled into a 15-section guide. Dunlop vs Talalay, ILD firmness, certifications, off-gassing, allergies, lifespan, and how to choose your perfect configuration.
