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Zinus

Zinus 4 Inch Low Profile Quick Lock Smart Box Spring/Mattress Foundation/Strong Steel Structure/Easy Assembly, Full, White

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Availability: In Stock.
Fulfilled by Amazon
Arrives Friday, May 29
Order within 15 hours and 47 minutes
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Size: Full


Style: 4 Inch


Pattern Name: Smart Box Spring


Features

  • Steel Interior Frame With Steel Slats and a Poly Jacquard Cover
  • HASSLE & HEADACHE FREE - The Quick Lock Metal Smart Box Spring comes together with easy-to-follow instructions, fewer bolts and absolutely no headaches; assembly thats intuitive and packaging that seems to defy the laws of physics - now thats what we call a new-age box spring
  • DURABLY ENGINEERED - A durable steel frame is used to construct the interior framework of this foundation; twin size supports a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs
  • LOW PROFILE DESIGN - A 4 inch height is perfect for taller mattresses or for those who enjoy their bed lower to the floor
  • THOUGHTFULLY PACKAGED - All parts, tools and instructions are packed into one compact box that ships straight to your door; Quick Snap assembly system makes set-up intuitive and stress-free
  • Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately

Description

We like to think of the Quick Lock Metal Smart Box Spring as the 2.0 version of your traditional mattress foundation. Made sturdier than ever by its substantial steel frame and with its game-changing assembly method, we’ve developed a better way to deliver great sleep to your door. Created with closely spaced slats to accompany your latex, memory foam or spring mattress, this durable box spring comes in three different thicknesses so your bed can be as short or as tall as you like it. The Smart Box Spring features our fool- proof Quick Lock assembly system, meaning you spend less time screwing in bolts, and you get to be pleasantly surprised by how simply and quickly it comes together. You may even pat yourself on the back once you’re done (in fact, we encourage that). We’re so sure of this foundation (along with hundreds of happy customers) that it’s backed by a 5 year worry-free warranty, so you can sleep confidently for years to come.

Size: Full


Material: Alloy Steel, Fabric


Style: 4 Inch


Special Feature: Quick Lock Assembly


Color: White


Other Special Features of the Product: Quick Lock Assembly


Included Components: Foundation, Steel Slat, Cover


Brand Name: Zinus


Manufacturer: Zinus


UPC: 841550204193


Global Trade Identification Number: 93


Manufacturer Warranty Description: Worry-free 5 year limited warranty included.


Manufacturer Part Number: OLB-QLBS-4F


Model Number: OLB-QLBS-4F


Set Name: SmartBase


Unit Count: 1.0 Count


Item Type Name: Box Springs


Required Assembly: Yes


Assembly Instructions Description: Instructions provided for easy and intuitive assembly


Style Name: 4 Inch


Color: White


Furniture Finish: White


Form Factor: Low-profile, Rectangular Box Spring


Shape: Rectangular


Compatible With Mattress Size: Full


Maximum Weight Recommendation: 700 Pounds


Size: Full


Item Weight: 41.1 Pounds


Item Dimensions: 74 x 53 x 4 inches


Item Depth: 4 inches


Material Type: Alloy Steel, Fabric


Headboard Material: Alloy Steel


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 29

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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Similar Products

Top Amazon Reviews

    • Brilliant and Functional
Size: King Style: 4 Inch Pattern Name: Smart Box Spring
This comes in a box weighing about 60 pounds. You can lug the box, or open it and cart the materials. Might take 4 trips. No big deal. Comes with extremely easy instructions, extra screws, and a small ratchet. No other tools needed. It goes together in about a half hour with one person. I got the king size and it fits fine. Very solid, no wonky give and no squeaks. People who write that it is hard to assemble likely struggle with making coffee. Hand screw the bolts everywhere, stand it on its edge, and tighten everything down. This way there is a little “play” which makes inserting bolts easy. Then lay it down and snap in the cross members. No hammer, no mallet. Just push in place and if needed, use your foot. There are no legs, it simply rests atop the existing wooden bed frame, headboard, sideboard. Fits just fine. I left the existing 1x4 slats and put this on top. The end result is a 4 inch deep frame that has cross members 3 inches apart. Plenty sturdy and very supportive. We replaced two 9 inch box springs and were able to lower the bed height with no loss of comfort. I did not bother with the cover because I simply saw no need for it since the sideboards hide the frame.. But if it is exposed, i suppose it does dress it up a tad, so do as you please. I’m very happy with it. BTW, the mattress is a 14 inch Satava pillow top if you were wondering. ... show more
Reviewed in the United States on May 18, 2025 by JL Price in Florida
    • Easy to assemble. Excellent quality. Sturdier than expected.
Size: King Style: 4 Inch Pattern Name: Smart Box Spring
Was skeptical but after assembly this bed support felt pretty sturdy. We purchased a Costco King-sized memory foam mattress and required 4" to bring the bottom of our mattress to the top of our bedframe. So far 3 weeks in and there is no squeaks or complaints. Ensure you have the correct orientation of the middle support beam, there is a thin layer of foam to keep the cross bars from rubbing metal to metal. I suspect the negative reviews due to noise are because this beam was installed upside down (Foam downwards). I considered using blue locktite for the fasteners but decided against this until the frame squeaks for the first time. This is excellent value and quality. Would buy again. This also appears to support a memory foam mattress properly with the 22 support cross-members. I also love how easy this can be put back into the box for moving. Box springs take up wayyy too much space for storage. ... show more
Reviewed in the United States on June 22, 2025 by Amazon22
    • Need a sturdy box spring for a Dream Cloud Hybrid Mattress, this is it!
Size: King Style: 4 Inch Pattern Name: Smart Box Spring
Review Image by Kindle Customer
Review Image by Kindle Customer
Review Image by Kindle Customer
Review Image by Kindle Customer
We recently purchased a Dream Cloud Premier Hybrid Mattress two weeks ago to replace the mattress we had had on our king size bed for the last 10 years. This new hybrid mattress we bought from the Dream Cloud web site is great, but at a height of 14 inches, it was 5 inches thicker than what we had. After it arrived we decided to keep and use the current double box spring we had been using, which were 9" thick, and metal bed frame with headboard that we already had. But we found with that 5 inches of increased height with our new hybrid mattredd that the top of the bed was now much higher then we liked. We love our new mattress, but with having our mattress 5 inches higher it was a little more effort to get on the bed and our feet didn't touch the floor when we sat on the edge of the bed. We were new to the hybrid mattress requirement of not needing a regular box spring, so we decided to see if we could go lower. I read all the reviews for platform bed frames designed for a hybrid mattress. Many of these reviews, the ones made out of wood, complained about their platform bed frame not holding up, with their wood slats cracking, breaking, and making noise, legs breaking off, etc. We surely didn't want any of that plus we wanted to keep out headboard at the same time. Those reviews helped us decide on trying this metal box spring by Zinus. We selected the 4" thick choice for our king size bed cause we wanted the bed top lower. Let me tell you, we are 100% satisfied with the way it is constructed, the ease of putting it together, and the way our new 14" hybrid mattress fits on it. Everything fit like a glove. It doesnt make a sound if we get up or toss and turn, and the mattress stays in place. Here are a few pictures we took as we put it together from start to finish. Before we put the new 4" metal box spring together, we removed those two 9" box springs we had to make room for the new metal one. It took us about 30-40 minutes to put the metal pieces together but it all went smooth. Everything fit nice and easy. The small rachet wrench that is included was a big help in tighting everything. And it only 16 screw bolts were required to fasten everything. Once finished, this new box spring fit right inside the original metal bed frame we had. The fabric cover went on next and fit over the top like a fitted bed sheet. Next we placed our new 14" mattress on top of everything and were very excited with our it fit the bed now. We actually had more mattress support when we laid on the bed. My husband and I were also now able to sit completely on each side of the bed with our feet on the floor. Having the top surface of the bed 5 inches lower on a metal frame strong enough also to support everything has made all the difference. We couldn't be more satisfied. If you have a king size hybrid mattress and want it lower to get on easier with plenty of support underneath this is the metal smart box spring to get. UPDATE: 7 days later. Both of use are enjoying our new mattress very much, thanks to the 4" metal box frame. No moverment what so ever, solid as a rock. The lower height we now have has made all the difference. One thing I wanted to add if you order the king size box, is the box is heavy. My husband had to use a 2-wheel dolly to move it from the front door, through the house and into the rear bedroom. But once the box is open, all the pieces are marked and easy to connect. 2nd UPDATE: Box spring frame is still doing good. Has been a month since we received this, and we'll still 100% satisfied with our purchase. The upper mattress does not move at all, and makes no noise getting on, moving about on it, or getting off of it. We like it enough that we're going to purchase a similar box spring like this for a twin bed that we have in another room sometime this year. ... show more
Reviewed in the United States on June 15, 2023 by Kindle Customer
    • Solid, high quality and quite!
Size: King Style: 4 Inch Pattern Name: Smart Box Spring
I highly recommend! This box spring is solid, and makes no noise! Very easy to put together. I saw some reviews about the slats being different sizes but mine were fine. The boxspring I bought before this one was 70$ cheaper but I guess you get what you pay for it was very loud and low quality material, so I returned it and got the Zinus, I’m very pleased! ... show more
Reviewed in the United States on January 26, 2026 by James franco

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