ZINUS No Assembly Metal Box Spring

Search for my username on YouTube (dugroz) and you can see my review/unboxing of the product. This low-profile foundation does exactly what it says it is supposed to do, and does it very well. It comes in a fairly large box and is a bit heavy, so an elderly or frail person would likely need help. However, once it is unboxed, there is no assembly needed, just unfold it, flip it over, and zip it up. (As others said, if you flip it open in the instinctive way, you need to flip it over.) It would be very easy to take with you in a move. This is not a "Box of Springs" - there are no springs inside. 95% of modern mattresses do not need a true "box spring" anyhow so that's fine. The purpose is just to raise up your mattress. It does not soften the mattress, nor is it designed to. "Foundation" is the better name. The bars are about 1/4 inch thick, and about 3 inches apart. The Foundation (as I measured it) was almost exactly 4 1/4" high (no big deal for me, but just noteworthy if you need "exactly" 4 inches in height). I was a bit Leary about using this with my Hybrid mattress since I was afraid that (because the bottom is foam) it would sink through. However, I emailed the mattress company and they assured me that this foundation is fine to use (I have a Sapira mattress). About 3 weeks of use so far, it's holding up fine, and the mattress works very well with it. Very sturdy, no sagging. No noise, no squeaking. We have a queen and it supports two grown adults just fine (the paperwork that came with it says that the queen size and up can support 2,400 lbs. of weight, which seems a bit ridiculous (2 people plus mattress weighing 2,400 lbs???), but the idea is that it is sturdy. . The sides are a nice patterned white cloth. Nice enough that we have not felt the need to cover it with a sheet like with did with our old one! I would recommend this foundation if 4 inches is the best height for your bed setup. Edit: 05/01/2017 - Still holding up great.