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Old 12-30-2016, 12:17 AM
Jawmaster Jawmaster is offline
Join Date: Dec 2016
Posts: 2
It's a parlor trick.

I used to work as a mattress designer, and I can tell you that improvised tests like these should be taken with a grain of salt.

The reason the eggs don't break is very simple: The top layer is a thin-walled grid -- individual walls can buckle easily under concentrated loads, but buckling several walls over a wider area takes much more force.

The egg has a very small cross-section, so it buckles individual grid walls easily. The glass plate above, on the other hand, has a high surface area, so it does not sink in as easily as the egg.

It's a neat parlor trick and clever marketing. But as other folks in this thread have stated, an egg is fundamentally different from a human user:
1) Eggs have a hard, brittle exterior. Humans have a soft tissue exterior. Soft tissues change shape and spread out over a wide area under pressure, while egg shells on the other hand resist shape changes.
2) Eggs - much smaller than humans, much less surface area. Human features are generally less "pointy" - sleepers have much more in common with the test's glass pane than the egg.

Also, I see a few critical flaws in this bed's design:
1) As a whole, the grid doesn't provide much surface area for a user's body, compared to traditional solid foam. If you were to map body pressure, you would likely see that pressure concentrates on the top of each grid wall, spiking at the grid intersections. Nonuniform pressure distributions like this can lead to severe discomfort and pressure sores over time.
2) None of the layers appear to have any "zoning". So it's very unlikely that the lower back will have more support compared to the hips and shoulders, which can lead to back pain over time. This can also lead to an unbalanced sleeping position that concentrates pressure in either the shoulders or hips.
3) The "hyperelastic polymer" doesn't breathe well, trapping heat. Memory foam has a similar problem.
4) 2" is woefully thin for a top layer. Some Amazon reviewers commented that they had difficulty with side sleeping -- it's because the grid is "bottoming out" against the firmer foam layer underneath.

Sadly, mainstream mattress companies make these kinds of design mistakes ALL THE TIME -- the recurring theme is that mattresses are 1% hard science, 99% marketing spin. And guess which category Purple's "test" falls into...

Last edited by Jawmaster; 12-30-2016 at 12:21 AM.