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

I’m extremely happy with the ZINUS 9 Inch WonderBox™ Smart Box Spring! From the moment I opened the box, I was impressed by the thoughtful packaging and clear instructions. Assembly was quick and straightforward—I had it fully put together in under 30 minutes with no tools beyond what was provided.The build quality is excellent. It feels sturdy and supportive, with no creaking or shifting under the mattress. The 9-inch height is perfect—high enough to provide great clearance and support, but not so tall that it raises the bed too much.One of the standout features for me was how compactly it ships. It’s amazing how a full box spring fits into such a manageable box. This made moving it through doorways and tight hallways a breeze.Overall, ZINUS really delivered on both convenience and durability. If you’re looking for a reliable, easy-to-assemble box spring that doesn’t sacrifice quality, this one is a winner!

I purchased this based on reviews. I recently got a memory foam mattress for my guest bedroom and I needed a foundation (box spring) for it. After doing some research this seemed like the best thing to purchase. When I got the box I was a little worried. It seemed like it had way too much tape on it. Was it a return? After opening the box it wasn't a return and everything was there. Maybe the extra tape was for the weight of the box. I looked at the pieces and pictures began to assemble. About 30 minutes later I had a box spring. The hardest part was putting in the screws for the center support. I didn't have my readers with me and seeing the holes was a small task. I put on the snug covering and put on the mattress. I think I'm going to give it a test tonight. If you're on the fence about this go ahead a get it.

Super easy to put together, just align and click. There were 8 bolts to install, but it came with nice little ratchet hex key that made that easy as well.

Came earlier than expected so I was very happy for that and building it was fairly easy would’ve given it 5 starts but the this product had been returned. Some of the pieces were not together with the ties inside the box. Not too bad though it did the job

Bueno

Easy to assemble and sturdy box spring for mattress.

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.

I never write product reviews, but this was such an awesome purchase. This is the BEST box spring I have ever owned. If you’re on the fence about buying this product, or you’re trying to decide between options, here’s a number of reasons to go with this one.1. Noise Level: NONE. Completely silent. This was my #1 reason for wanting a new box spring in the first place, and it does not disappoint. Our previous box spring (the traditional wood/spring kind) had become squeaky over the years, and kept waking up our 5 month old baby. This new box spring hasn’t made one tiny noise since day one - our baby has been sleeping through the night. Relief is an understatement.2. Sturdiness: I have never felt so supported by my bed. It feels even better than when our previous box spring was brand new, so I know it’s not just because it’s new. I have chronic shoulder pain, and while a new box spring obviously isn’t a cure, I have been waking up significantly less sore for the first time in years. My husband doesn’t have the same pain issues, but he agrees that our bed feels much more sturdy and comfortable, because our bodies are better supported.3. Assembly: So easy. I am not in my greatest shape (I did just have a baby), but I was able to put it together without my husband’s help. The box comes with some screws and an Alan key, and that’s honestly all that’s needed. The directions are pretty easy to follow. I will say that the “Up” stickers were placed on the parts in a way that was a little confusing at times, but if you pay close attention to the pictures in the instructions, you’ll be fine. It took me less than an hour.I cannot recommend this box spring enough. Do yourselves a favor and purchase this. You can thank me later. :)