Sleep Science Black Diamond 11" - Any Thoughts?

I recently returned my NovaForm Mattress (Costco) after 8 months of use. The mattress was mostly comfortable but I dont’ think it ever fully “inflated” once it was removed from the box. It was uneven and seemed to suffer from Alzheimer’s (took ages to return to default position).

I originally thought about purchasing the Simmons ComforPedic Renew but would prefer to stay with Costco given my Cash Card situation from my mattress return.

In short, I came across this Sleep Science Black Diamond 11" Queen Memory Foam Mattress. Based off what I’ve read here, it seems to have some quality foam though it will probably be a very firm mattress. Here are the specs:

  • 11" Black Diamond Memory Foam Mattress fits the dimensions of your bed.
  • Meets the requirements of 16 CFR Part 1633 – federal flammability (open flame) standards
  • Limited Warranty: 20 Years
  • Mattress cover sleeping surface is made with a silk blend fabric.
  • The cover is removable and washable.
  • Mattress top layer: 1" of proprietary 5 lb black diamond bamboo charcoal visco memory foam.
  • Second layer: 1" of proprietary 5 lb slumber tech visco memory foam.
  • Third layer: 2" of medium latex
  • Bottom layer: 7" proprietary support tech base foam.
  • Patented wedge, edge to edge Support System

Any thoughts on this mattress based on the spec sheet? The mattress has great reviews on Costco but with my previous Mattress in a Box experience I’m a bit nervous.
Thanks in advance,

Hi Breezer23,

You can see my thoughts about the Sleep Science 11" Black Diamond mattress in post #4 here.

Overall it appears that the quality of the materials is good (with the cautions I mentioned in the post I linked) but they are imported from China and don’t have any certification for VOC’s and offgassing which along with knowing how long the mattress may have been compressed would be my main concerns (see post #6 here and post #2 here).

Of course with Costco you are also rolling the dice about whether the mattress is a suitable match for you in terms of PPP because they don’t provide any real guidance for their customers but at least you have the benefit of a good return policy if it turns out not to be a good match for you (see post #4 here for my thoughts about buying from a big box store like Costco).

As you probably know I don’t pay much attention to mattress reviews because they don’t generally give any information about the quality of the materials or the durability of the mattress and since each person’s experience on a mattress can be very different from someone else or even the majority of people, they also don’t provide much meaningful information about whether a mattress is a suitable choice for any particular person (see post #13 here).

Overall I would say it’s likely a good quality choice and while it wouldn’t be my first choice for the reasons and uncertainties I mentioned, at least the Costco return policy lowers the risk of giving it a try if you are comfortable with buying a mattress that uses memory foam that has no certification.


You’re a good man. Thank you!