FLOCK uses the diversity of European sheep breeds and their wool, which is wasted by the tonne due to its coarse fibre structure and thus its lack of suitability for clothing. Robotic fabrication is employed to transform the wool mechanically into load-bearing three-dimensional felts with targeted varying degrees of hardness. It enables precise programming of the properties from firm and sturdy to flexible and soft and their reproduction within a mono-material. In the project, a modifiable felting machine and a three-dimensional felting process were developed. The poly-qualitative properties of wool felt were investigated and transferred into a concept for mono-material upholstered furniture by reinterpreting traditional felting techniques. The resulting upholstered stool visualises the range of material properties and was developed to make research more accessible through design.