Unlike most of our competition, our Cork Mat is made with a 100% natural rubber base layer topped with a renewable, sustainable cork top layer. While natural cork provides superior wet and dry grip, it is ideal in heated and hot yoga classes because as temperatures rise, cork begins to loosen and becomes softer & easier to grip. It's also moisture-activated - becoming grippier as it gets wet. Truly nature's best solution for towel-free traction. Cork is also closed-cell and naturally anti-microbial, sealing out moisture & resisting odor and bacteria from sweat. Our natural rubber base layer offers a unique springy ride that cushions and protects joints, while also remaining stable and supportive in any pose. Stays put on the floor better than foam base layers and provides denser cushioning.