






🛏️ Elevate your sleep game with the Smart Box Spring — where strength meets style and simplicity!
The Sleep Master Smart Box Spring King features a sturdy alloy steel frame wrapped in a sleek knitted polyester cover, designed for easy assembly in just 45 minutes with all tools included. Measuring 76"x79"x9", it offers a stable, flat foundation for your mattress, backed by a 5-year warranty. Its compact packaging and lightweight design make it perfect for millennials who value convenience, durability, and modern aesthetics in bedroom essentials.
















| Best Sellers Rank | #42,449 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #31 in Box Springs |
| Color | Grey |
| Customer Reviews | 4.5 out of 5 stars 82,502 Reviews |
| Finish Type | Metal |
| Material | Alloy Steel |
| Size | King |
| Special Feature | Easy assembly |
| Style | Original |
L**E
Easy 45 Minute Assembly with sticky notes
I knew there were going to be a lot of parts, so I decided to be as organized as possible. After opening the box, I marked each group of items with a sticky note to make assembly as easy as possible. It took 45 minutes total to label, assemble, and put the cover on. I especially loved the mini ratchet tool that was included; it made tightening everything much faster and easier than using a standard allen wrench. Everything fit as expected and was easy to move into our rolling adjustment frame. The King mattress fits nicely on the metal box spring and does not slide around at all. It looks great and feels very solid. We are looking forward to having family visit and hope they enjoy the comfort. If you take the time to organize the pieces first and use the provided ratchet, this is a very straightforward and high-quality setup
B**D
Best Box Spring Ever!
This product is great, I am 100% satisfied with this purchase. I am using this box spring with a Nature Sleep memory foam mattress. If you have an innerspring mattress your mileage may vary. My review as follows will cover several different aspects of this product and why they are great. Portability: Who knew you could assemble a box spring instead of lugging around a 50+ pound bulky wooden frame? Once assembled, the frame is lightweight and much easier to move around than a traditional box spring. The next time I move I am just going to take it apart instead of it taking up space in the moving truck, very economical in that sense. Assembly: Assembly was very easy, no mechanical inclinations required from the assembler. The set comes with an allen wrench/hex key and you use that to hold bolts in place while you tighten wingnuts with your fingers. Please ignore any reviewer of this product who said it was too difficult to assemble, took too long, or had confusing instructions, they are either lazy or completely incompetent. It took me about an hour to assemble by myself, and it would have taken even less time if I hadn't been half watching TV and drinking a beer while I was putting it together. The instructions aren't written words, but pictures showing which pieces to assemble with which bolts, but if you ever built a Lego set when you were a kid you should be able to handle this. It is easy to tell which pieces should be facing up during assembly, because most have a 'this side up' sticker. The pieces that don't, it either doesn't matter which side is up or you can tell which side should be up because of the notches the slats will fit into at the end. The Cover/ Looks: The zip cover looks nice and the white sides are a soft plush. Make sure you sweep your floor before zipping the cover on though or you might get dirt all over the nice white part. Some people said that the cover ripped when they were zipping it up, that was not the case for me. The cover is a very tight and perfect fit, but the white sides stretch. So when you zip it on, don't just yank on the zipper as hard as you can, pull up on the white parts that stretch and it will make the zipper easier to close. Durability: It seems sturdy enough to me. I have had for two weeks, no complaints. I have unzipped and re-examined the frame and it has not bent or buckled under the weight of two people or any vigorous activity. Could you bend the metal of the frame after you put it together? I guess you could if you tried to, but why would you do that deliberately? Putting a mattress on top of it and using as intended should leave you with no issues. I hope this review provided all the information needed to help in your purchase decision, and I am sure you will be satisfied with this box spring.
H**.
Good buy!
Super easy to put together, sturdy, and fits perfect. It’s also light enough that I could drag it to the bedroom after putting it together and I’m pretty weak lol
V**Y
Sturdy and Easy to Assemble
This box spring is solid and supports our mattress perfectly. Assembly was quick with clear instructions. Great value and quality—highly recommend
D**.
Great quality, packaging and everything included for assembly
Loved the fact that it arrived in a compact box making it very manageable to carry through the house and into the bedroom as I have a very small and constricted floor plan. Upon opening the box it seemed a bit overwhelming but once I looked at the instructions and the diagram of the labeling of the pieces I was very impressed with how easy it was to lay out and put together. All the hardware fit smoothly and was easy to put together using only the tools that were supplied. That in itself was a touch of class, to be provided those items and not have to find and size up my own tools. The quality of the hardware as well as the packaging was well thought out and I appreciated the extra nuts and bolts. I actually used the extra nuts to double nut the two long bolts that secured the middle cross members together in the center of the box to ensure they don't work their way loose over time. The nuts and bolts looked to be well made and the shouldered and serated locking surfaces of the nuts weren't lost on me. That was a great selection of fasteners. The bolts were made very well and the heads did not ring out or become deformed from being tightened and kept their integrity and shape so as to be removed for disassembley in the future if needed. All the frame work pieces had a very nice finish to them appearing to be powder coated. The final addition of the frame cover was an added item that enhanced the overall quality and appearance of the total package once it was fully assembled. Total assembly time was no more than an hour by myself and being put together on and inside an existing raised oak bedframe with large headboards and side rails. Very pleased with this excellent product and would most definitely buy again and recommend to others looking for a similar item to fit their needs and lifestyle.
A**Z
Sturdy, perfect height & quiet.
Purchased this box spring years ago and the initial build was simple and easy enough for me to build alone. I never had issues with noises or mattress sliding on it. It was sturdy and maintained its sturdiness over ~5 years. I took it apart today and was surprised to see the screws looked great after being removed. Would purchase the product again next time i need a new box spring.
I**R
Easy assembly, robust frame, fits bed exactly.
The box springs on our King size bed had begun to creak with even the slightest weight on them. When we investigated, we found a wooden frame nailed together and topped with a thin plywood board - so there was no way to tighten the frame and stop the noises. We decided to buy two of the Easy Assembly Zinus Twin XL box springs, hoping that they would be robust enough for use in a rental unit, and that the assembly would not turn out to be a nightmare. We need not to have worried! I assembled the first of the two in 15 minutes, and my wife and I completed the other in 10. Adding the cloth cover was no problem at all, despite some of the comments we have seen from others. Once complete, the two units fitted neatly and easily onto our bedframe. It remains to be seen how long the product lasts, but from the look of it, I expect we will get a good life out of it. The assembled unit is firm and the bed remains comfortable. I am happy to recommend this product.
A**R
Easy to build, too good to be true (it seems)
It is rare when I take the time to sit down and write a review but this time I felt it was necessary. We needed a new box spring as my wife and I are like giant children. We jump around, we wrestle, and we've cracked the boards in our current box spring to the point that the mattress sinks in the middle. I was soooooo close to ordering a box spring from mattress warehouse when I thought to myself "I wonder if Amazon sells box springs". This product was the first to show up, and I questioned buying it because of all of the negative reviews. "The product isnt to size, the product is missing parts, it's difficult to assemble, it's impossible to get the cover over it, etc." I took a shot because I figure I'm pretty handy and we were in desperate need. Opening the box is quite overwhelming due to the amount of parts, but a simple glance at the directions put me at ease. While the parts aren't labeled "a,b,c" physically on them, it doesnt take a rocket scientist to look at what's in front of you and match it to the picture. I didn't use the tools that came with the kit because I have my own. If I used their tools of course it'd be a pain in the ass, but what would you expect from a dinky little hex key and flat wrench. That is the standard basic tools set you get in EVERY SINGLE build it yourself furniture item. Obviously their tools are no different and they are trash, but you should know that already. The build took me roughly 25 minutes as there are a total of 14bolts and 10 nuts that you have to put in place. So far no issues at all to my surprise, everything was smooth as silk. Then came the "hard part" putting the cover onto the box spring. The panic began to set in as I have been told by so many reviewers that this was a huge deal and i would struggle. Again to my surprise I had zero issues whatsoever and it slid on with ease. So how did I do it you ask? Logic told me the easiest way to do this was to stand the frame upright. Since everything was very well secured in place (to my surprise) there was no reason why I couldn't do this. I placed the cover over the top 2 corners, zipped it slightly and moved down to the bottom. The only "issue" was that I was by myself, so when I was pulling the cover over the bottom, I almost tipped the frame over into my TV. That said, if you have someone to hold it for you, you won't have a problem. I cant speak on behalf of the quality as I just received it and built it today so that will be a follow up review. As far as building it, if you can follow instructions with or without your own tools a child can put this together. (With your own tools makes it easier, but not required.) I used a screwdriver with a hex key insert, and a socket wrench.
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