An open cell surface has microscopic pores that absorb moisture, so it grips better as you sweat and needs more careful cleaning. A closed cell surface is sealed, so sweat sits on top instead of soaking in, which makes it hygienic and easy to wipe but means a wet surface can get slippery. Neither is better. They fail in opposite directions.
Open cell absorbs the sweat. Closed cell keeps it out. Everything else follows from that one difference.
What the terms actually describe
They refer to the structure of the material at the surface, not to a coating applied afterwards.
- Open cell. The cells at the surface are interconnected and open to the air. Liquid is drawn in, which is why grip improves with moisture and why the mat needs to dry properly.
- Closed cell. The cells are sealed off from each other. Liquid stays on the surface, which is why it wipes clean and why nothing gets into the mat.
Cork behaves like an open cell surface in practice, which is why it grips better the more you sweat. Most PVC and TPE mats are closed cell.
The trade, side by side
| Open cell | Closed cell | |
|---|---|---|
| Grip when sweaty | Improves | Can get slippery |
| Grip when dry | Good | Very good |
| Cleaning | Needs drying through, not just wiping | Wipe and it is done |
| Bacteria and odour | Can absorb into the mat | Stays on the surface |
| Best for | Hot yoga, heavy sweaters | General practice, shared spaces |
The hygiene difference is the one people underestimate. An open cell mat that is rolled up damp after a sweaty session has taken the moisture inside with it, and that is where a musty smell comes from later. We cover that in does a natural rubber mat smell.
Which one suits your practice
- An open cell surface suits hot yoga, or sweating heavily enough that a towel is part of your kit. The wet grip advantage is real and it is the situation closed cell handles worst.
- A closed cell surface suits hatha, yin, vinyasa or a general daily routine, sharing the mat, and wiping it down in ten seconds. It is what ours has, on both faces.
If you are choosing on hygiene, closed cell wins outright, and that matters more than people expect in a studio or a shared home.
What it does not tell you
Two things get confused with this, and neither follows from it:
- Cell structure is not the material. A closed cell mat can be natural rubber, TPE or PVC. Knowing the structure tells you how it behaves with sweat, not what it is made of or what happens to it at the end of its life.
- Cell structure is not thickness. Cushioning comes from how much material is under you, not from whether the cells are sealed.
Anyone selling closed cell as inherently higher quality is describing a property as if it were a grade.
Which one ours is, and why
Our mat has a closed cell surface, on both sides, since it is reversible. It was the right call for the practice it is built for: a general daily routine on a hard floor, wiped down in seconds, with nothing soaking into the material.
The honest consequence is the one in the table. In a genuinely sweaty session, a closed cell surface eventually loses to an open cell one, which is part of why an open cell surface behaves differently once you sweat, and why we do not recommend this mat for hot yoga.
Common questions
Can I make a closed cell mat grip better when wet?
A towel over the top is the standard answer and it works. It is also an admission that the surface is not the right one for that session.
Is open cell less hygienic?
It absorbs more, so it needs drying properly rather than rolling up damp. Cared for, it is fine. Neglected, it holds onto more than a closed cell mat would.
Does open cell wear out faster?
Not inherently. What shortens any mat's life is the surface polishing smooth, which we cover in how long a natural rubber mat lasts.
How do I tell which one I have?
Put a few drops of water on it. If they bead and sit there, it is closed cell. If they soak in and darken the surface, it is open.
The short version
Open cell for sweat, closed cell for hygiene and everything else. It describes how the surface handles moisture and nothing more, so decide it alongside the material rather than instead of it.
More on what our mat is made of in our guide to natural rubber yoga mats. More about the Eco Daily non-slip natural rubber yoga mat. What that cell structure buys you in practice is the subject of our guide to non-slip yoga mats.
