The eKO Series is a natural yoga mat made from sustainably harvested tree rubber. Unlike other rubber mats available today, the foaming agents used to create the eKO are non-toxic. What this means is that no toxic chemicals have gone into the manufacturing process to soften the rubber. eKO Series mats are the most durable natural rubber mats on the market, which means the mat will last longer before you have to replace it, therefore, creating less waste. Crafted in Taiwan.