Open-Cell Foam

Open-cell foam has an interconnected bubble structure — like a sponge — where the walls between adjacent cells are not fully sealed. This creates a material that absorbs moisture, which has both advantages and disadvantages for yoga mat performance.

How Open-Cell Construction Works

In open-cell foam, gas bubbles are interconnected. When pressure is applied (like a hand pressing the mat), air and moisture can move through the foam network. This creates a softer, more cushioned feel than closed-cell foam of equal density. Moisture absorption keeps the surface drier. Better breathability and airflow move through the mat.

Natural Rubber and Open-Cell Structure

Natural rubber yoga mats often use open-cell construction on the top surface. This is why natural rubber mats can actually get grippier as you sweat — moisture is partially absorbed into the open-cell structure rather than pooling on the surface.

The Manduka PRO mat uses an open-cell top surface that similarly improves grip as moisture is absorbed during practice.

Trade-offs

Open-cell mats require more careful maintenance:

• Must be thoroughly dried after each use to prevent mold and bacteria growth
• Cannot be submerged in water or machine washed (the foam absorbs and holds water)
• Must be cleaned with spray-and-wipe method, not soaking

The reward is superior grip in sweaty conditions — a significant practical advantage for hot yoga or vigorous vinyasa practitioners.