Alersé feels it is super important to be good to our bodies. That's why they wanted to make sure their mats support a healthy mind and body, using recycled materials that are body and Earth friendly. Alersé did the research and use NO PVC or harsh chemicals in Alersé mats - 75% of the mat is recycled plastics which is good for you and the planet. Alersés OmFoam contains 20% algae. That's the green stuff that grows in rivers and the ocean. It makes it so their mats are Renewable, Reduce the carbon footprint and Rejuvenate eco-systems by removing harmful algae, leaving clean water. Alersé mats clean 1,636 liters of water and 1,025 cubic meters of air.