The core activity of the company 'Save the Yarn - byKrøjer' is the marketing and sale of sustainable yarns made from factory leftovers that would otherwise be destroyed. The company offers a wide range of yarns, including wool, silk, cotton, linen, and other natural fibers, as well as special products such as 'One of a Kind Cones' and 'Recycled' yarn. By selling these products, the company aims to contribute to environmental protection by avoiding the destruction of yarn and instead finding a second use for these materials.