Knof is a brand that focuses on promoting sustainability and circular economy practices. With its mission to reduce waste and extend the lifespan of products, Knof has opened five boutiques called Stara šola (Old School) across Slovenia. These boutiques accept donated clothing and smaller items, which are then sold at affordable prices in three different price ranges.

Knof also offers franchising opportunities for those interested in establishing their own Stara šola boutique. In addition to the boutiques, Knof has launched a collection called KNOF, which features a selection of high-quality vintage clothing from the boutiques, as well as iconic furniture and decor pieces from their Salon line. Knof also offers services like Circular Lab, which helps businesses develop and implement sustainable strategies, and a range of other projects focused on reducing waste and promoting responsible consumption