New Eco-Friendly Material – More expensive but worth it. TPE is the latest technological improvement to the traditional yoga mats. No latex, no PVC, or any heavy metal. Our mats are made of SGS certified TPE material which is non-slip, odor-less, and excellent in cushioning, unlike those cheap & traditional non-green PVC, NBR, or EVA yoga mats. They are truly eco-friendly, healthy. Body Alignment System: The alignment lines help you to focus and adjust your hands and feet to the accurate position, and keep the body in proper alignment.