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Zinus

Zinus 9 Inch Full WonderBox(TM) Smart Box Spring, Quick Assembly Mattress Foundation, Durable Metal Frame, Grey

  • Based on 1,526 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Aug 4
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Size: Full


Style: 9 inch


Pattern Name: New Quick Assembly


Features

  • EASY DELIVERY & A CLEANER PLANET Delivered in our earth-friendly WonderBox that is surprisingly small and easy to maneuver through doorways and tight corners
  • EFFORTLESS ASSEMBLY: Tool-free design snaps together in minutes for a frustration-free setup
  • CUSTOMIZABLE COMFORT: Choose from two heights to create your perfect sleep oasis 5 inches for a lower profile, or 9 inches for an extra boost
  • DURABLE STEEL CONSTRUCTION: Provides long-lasting support for your mattress, maximizing comfort and lifespan
  • WORRY-FREE WARRANTY Sleep soundly with an included 5-year warranty. Box spring only, a bed frame or platform bed is required to support this foundation and is sold separately

Description

As the backbone for solid mattress support, a box spring that falls short can make or break your night’s sleep. We developed the Smart BoxSpring® with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, you’ll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring® is the picture of dependability for any mattress. All packed in a compact shipping box with everything included, even our 5-year worry free warranty! Now that’s peace of mind you can sleep on.

Size: Full


Material: Alloy Steel


Product Dimensions: 73.8"L x 53"W x 9"H


Style: 9 inch


Special Feature: Tool-free Assembly


Other Special Features of the Product: Tool-free Assembly


Included Components: Box Spring, Installation Manual


Brand Name: Zinus


Manufacturer: Zinus


UPC: 841550372700


Global Trade Identification Number: 00


Manufacturer Part Number: ZU-FBSSG1OC-09F


Model Number: ZU-FBSSG1OC-09F


Unit Count: 1.0 Count


Item Type Name: Quick Assembly Mattress Foundation, Durable Metal Frame


Material Type: Alloy Steel


Required Assembly: Yes


Assembly Instructions Description: Tool-free assembly instructions included, snaps together in minutes.


Style Name: 9 inch


Color: Grey


Finish Types: Unfinished


Furniture Finish: Grey


Form Factor: Platform Bed


Shape: Rectangular


Compatible With Mattress Size: Full


Maximum Weight Recommendation: 700 Pounds


Size: Full


Item Dimensions L x W x H: 73.8"L x 53"W x 9"H


Item Weight: 13.48 Kilograms


Ground To Item Distance: 9 Inches


Item Dimensions: 73.8 x 53 x 9 inches


Item Depth: 9 inches


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Aug 4

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • This is just what you are looking for.
Size: Queen Style: 7 inch Pattern Name: New Quick Assembly
Clear instructions, Very easy to put together. Sturdy, high quality. Great value for the money.
Reviewed in the United States on May 28, 2026 by Suzanne
    • Very sturdy and surprisingly quiet
Size: King Style: 9 inch Pattern Name: New Quick Assembly
I’m honestly impressed with this foundation. I bought the king size and was expecting it to be heavy and complicated, but it was actually very easy to put together. The frame feels solid once it’s assembled, and it doesn’t wobble or shift when you get in and out of bed. What I like the most is that it makes absolutely no noise. No squeaks, no movement sounds at all. The support is firm in a good way, and the surface feels steady under the mattress. It also doesn’t weigh as much as I expected, so moving it around wasn’t a problem. Overall, it looks clean, feels durable, and holds the mattress perfectly without sliding. The height is perfect to match the regular bed headboard. (4 " works )Great buy. ... show more
Reviewed in the United States on November 19, 2025 by Amaris23
    • Terrible construction and won’t stay put together. Terrible construction and won’t stay put together.
Size: Queen Style: 5 inch Pattern Name: New Quick Assembly
Review Image by Gillian Murphy
Review Image by Gillian Murphy
Review Image by Gillian Murphy
If I could give this zero stars I would. Not particularly easy to assemble since everything came unlabeled, the directions just a couple pictures, but I figured it out. Purchased it to make my new bed firmer which it did do! But it does slide around a bit, annoying but again no big deal, I would just slide it back in place and planned on putting down rubber strips or something to help it grip. The issue: Occasionally when rolling over I heard a pop and worried something was breaking and woke up today with the corner of my mattress sinking. I pulled the bed off and realized a lot of the slats had come loose and the bed was sinking inside the frame. The slats aren’t long enough to meet all the way inside their little holders and every time the frame shifts they pop out of place. The four outside sides aren’t screwed in so they can be pulled slightly apart and they just pop right out. Seems like it wouldn’t be a big deal, but since it slides around on my frame it keeps popping out. Also the plastic joints holding the two middle pieces together have a small plastic piece holding it on, so no matter how you place it the weight of the mattress slightly off the frame pops it out of place and that is also contributing to the issue with the slats. Seems dangerous and bad for your mattress. I’m super frustrated with how this turned out and now I’m going to have figure out how to disassemble the whole thing and return it somehow. See pictures for a better explanation. ... show more
Reviewed in the United States on May 22, 2025 Reviewed in the United States on May 22, 2025 by Gillian Murphy
    • Easy to put together and can break down and move easy
Size: Queen Style: 9 inch Pattern Name: New Quick Assembly
What a great idea! This has been perfect and easy to break down when moving.
Reviewed in the United States on June 14, 2026 by likethatbunny
    • Good Value Modifications Recommended
Size: Full Style: 9 inch Pattern Name: New Quick Assembly
The Positives: -It was pretty simple to assemble (or would have been see cons). Just 6 screws. Straightforward instructions. Minimal parts to connect. -It feels solid with two adults and a child in it. -Not Noisy so far. Silent in fact. I was concerned about it being noisy so I added electrical tape at all metal to metal contact points. Particularly the end of the cross braces. This made things fit tighter and there shouldn't be any metal rubbing together now. Can't say this made the difference but it is quiet. -Price. Local retailers were quoting me 2-3 hundred for a traditional box spring. Apparently they aren't commonly used anymore which is the reason stated for the high prices. -The cover was easy to fit. It's basically just a fitted bed sheet. Cons: -No surprise, the metal is the typical cheap Chinese pot metal. -The machining for one of 6 screw holes was missing most of it's threads. This made it impossible to assemble using the screws provided. Thankfully I had a box of nuts and bolts and was able to complete the assembly without the screw. -Two of the cross braces didn't have the plastic grommet in the end of them. This would have meant extra metal to metal contact. I remedied this by fashioning my own grommet out of furniture foot pads. I shouldn't have needed to do this but I'm sure it will work better now anyway. Tip: Use electrical tape at all metal to metal contact points to avoid noisy metal to metal friction. This was at the end of cross braces and then the center contact point where 4 screws are connected. Summary: It was a very cheap solution that seems to solve the problem. If you don't have a little Macgyver ability you might want to avoid this. The quality of the material and machining matches the price. Ease of assembly with simple instructions is a plus. Will update if the thing falls apart. Update 3/4/26: Still holding up. Haven't had to tighten anything and it's still quiet. Keep in mind though that this is being used for a childs bed but Mom and Dad do spend a fair amount of time getting in and out of it. ... show more
Reviewed in the United States on December 9, 2024 by Beau
    • Great product
Size: King Style: 9 inch Pattern Name: New Quick Assembly
Easy to assemble . Fit my king matress perfy
Reviewed in the United States on June 12, 2026 by Rachael
    • The product is okay overall
Size: Queen Style: 9 inch Pattern Name: New Quick Assembly
I bought this box spring based off of the reviews I read on here because they looked great and a lot of them mentioned the easy assembly. I had just purchased one of their beds and love it so I figured this product would be great too but when I opened the box it looked like a return as all of the zip ties had been cut off the metal pieces. When I started assembling the product it went very smooth until I got to the middle piece that you have to screw together. I had to flip the parts upside down for one of the screws to go in. The other screw would not foil in at all. It seems like the part wasn’t made properly for it to screw in. What the reviews said was a 30 minute set up was a 2 hour set up for me trying to get the screw in and widen the hole. I’m not too concerned about it since one of the screws went in and the metal slats are in place but for the price you should be getting a new product that all the pieces fit smoothly so I’m slightly disappointed about that. Other than that the product looks great and it seems pretty sturdy. Next time I would definitely spend a little bit more money at American Furniture or somewhere to make sure this doesn’t happen again. ... show more
Reviewed in the United States on February 24, 2025 by Penny S.
    • Perfect solution for box
Size: Full Style: 5 inch Pattern Name: New Quick Assembly
We got a new bed frame for my young teen son which required a box spring mattress. I was not looking forward to having another giant mattress to drag upstairs. This frame was the perfect solution at a great price. The delivery box wasn't too big (compared to a full-sized mattress), and it was pretty easy to put together in just a few minutes. It seems to be pretty sturdy. I also like that it came with a fabric cover, although, it did have a small tear which won't even be noticeable with the main mattress on top. ... show more
Reviewed in the United States on July 31, 2025 by RPowell

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