Answers, built from engineering.
Plain explanations of how mattresses, pillows, and sleep structure actually work — written by the people who build them.
Why mattresses sag in the middle.
Sagging isn't material wear — it's structural failure. The center third carries most of body weight, and most mattresses are built uniformly edge to edge.
Browse by question type.
Understanding Mattresses.
Why mattresses soften, why "firm" doesn't mean supportive, and what actually wears out. The mechanics behind it.
Buying Better.
Decision help before you buy. What to look at, what to ignore, and how to read marketing claims at face value.
Sleeping Better.
What your mattress is doing now — dips, morning soreness, sagging, uneven support. What the signs mean and what to check.
All articles.
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Does a firm mattress mean good support?
Read →No—firmness is how hard the surface feels, while support is whether the structure holds your spine in line over time. A firm mattress can have a weak core that lets your hips sink, and a softer mattress can be strongly supportive. Structure decides support, not surface hardness.
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Why does my mattress feel uneven?
Read →A mattress feels uneven when one area has lost support while the rest hasn't—usually a softer, lower center against firmer edges. Sometimes the unevenness is the foundation underneath, not the mattress itself.
N°02
The technology behind these answers.
Manchot's StasisLayer® System is the structural reasoning that informs every article here.
Engineering, when explained clearly, doesn't need to sell itself.