Yoga Design Lab Cork Yoga Mat 1.5mm Mandala BlackYoga Design Lab Cork Yoga Mat 1. 5mm Mandala Black Yoga Design Lab Cork Yoga Mat 1. 5mm Mandala Black. 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