Open cell or closed cell is the spec that decides how your mat behaves when you sweat

Mats are sold on thickness. What actually changes your experience in a hot class is whether the surface is sealed.

Closed cell

The pores are sealed, so moisture stays on top. The mat wipes clean in seconds, never absorbs the smell of a studio, and lasts well because nothing gets inside it. The cost is that sweat pools on the surface, so the mat goes slippery in exactly the class where you need grip. A towel solves it, which is why so many people who own a premium closed-cell mat also own a towel.

Open cell

The surface takes moisture in. Grip holds up as you sweat, sometimes improving. The cost is maintenance: wiping the top does not finish the job, and a mat rolled away damp will smell within a week. These mats want air on both sides before storage and a proper wash now and then.

The third option

Polyurethane tops over a rubber base split the difference: sealed underneath, faintly absorbent on top. That is the construction behind most mats marketed for hot yoga, and it is a large part of why they cost more than the plain rubber mats underneath them.

What our catalogue looks like

Of the mats we track, 10 are closed cell and 5 are open cell. The split matters more than the brand: two mats from the same maker at the same thickness will behave differently in a hot room if one is sealed and the other is not.

The practical question is not which is better. It is whether you sweat, and whether you will actually wash a mat.