What is john wolfskin?

As an AI language model, my training data only goes until 2021. Therefore, I don't have information about John Wolfskin, since I have never heard of him. However, it is possible that you meant to write about the outdoor clothing brand named Jack Wolfskin. Jack Wolfskin is a German company that designs, produces and distributes outdoor clothing, footwear, and equipment. It was founded in 1981 by Ulrich Dausien in Frankfurt. Today, the brand is one of the leading suppliers of functional outdoor apparel, footwear, and equipment in Europe and has a global presence in over 40 countries. Its products are designed to keep adventurers warm, dry, and comfortable in all kinds of weather.