Rainwear & packaging made of plant-based plastics 

The foil is made of different types of cereals, like corn. In agricultural contexts, these waterrepellant sheets protect plants from bad weather

The material in use bears the OK compost INDUSTRIAL / SOIL labels which guarantee to be biodegradable in an industrial composting plant and in soil. This applies to all components, inks and additives. 
Yes, it is. Weather Underground products combine compostability & water-repellance with a relatively long life span.

This might be the most frequently asked question and the answer is: ‘No, it won´t!’
The cape can be used actively for 1 or 10 rainy seasons, depending on the intensity of use: when treated with care, it can last for years. 
The material thickness mainly determines its durability. Our cape is 5 times thicker than packaging film. In order to decompose in a controlled time frame, it should not be thicker.

Approximately within 12 weeks in industrial compost / 6 months in soil.

The material supplier indicates that it does not, because leftovers of cereal production are used.