On Running Sustainability:
The main material that On Running uses in its product line is polyester. It’s worth noting that the brand still uses some virgin polyester and polyamide. The process of making the latter is detrimental to the wider environment. On states that it is working towards using both 100% recycled Polyester (rPES) and 100% recycled Polyamide (rPA) for products. However, there is no evidence of when this change will take place.