It is made of 70% synthetic rubber and 30% natural rubber

Breathable Comfort : With an OnSteam® lining

yet slightly rugged

with a mix of synthetic and natural rubber in the sole

Vivobarefoot Primus Lite IV All Weather Mens – Obsidian Size:46 It is made of 70%Description Step into eco conscious functionality with this all weather men's shoe. Ideal for outdoor training and running. Supports natural foot movement and respects the environment. Natural Movement: Promotes flexibility and balance. Resistant design: With water resistant materials, this shoe offers a practical shoe in wet weather. At the same time easy maintenance. Environmentally conscious production: Made with recycled materials. Safe sole: A