These days, closed cell mats are gaining popularity for health reasons. And, when combined with a yoga towel, they offer the same kind of anti slip surface open cell mats provide. Closed cell mats, like the NOW Eco TPE Yoga mat is easy to clean, provides traction for sweaty hands, and latex, rubber and toxic free. Unlike open cell mats that are less dense and wear out more quickly, closed cell mats like the NOW Eco TPE, are denser and are difficult to wear out. And because they have closed cells, they don't absorb and retain sweat or provide a breeding ground for bacteria, viruses and fungi.