The 39.5mm case Clean Ocean has a very noble objective, as this is to help fund a project that captures plastic waste. In the modern world, we are surrounded by plastic with almost everything we use, and to capture discarded plastic in the ocean is a great way to reduce our carbon footprint. This also helps save marine wild life from ingesting plastic and dying as a result. In addition to this cause, the outer shell of the box is made from algae and the interior is made with recycled plastic parts. Check out the back of the case as well, which will show a unique pattern for every single watch out there. Recycled plastic, the Swiss way.