FLOCK uses the diversity of European sheep breeds and their wool, which is not suitable for clothing due to its coarse fibre structure and is therefore thrown away by the ton. Using robotic production, it is mechanically processed into a sustainable 3D felt with deliberately varying degrees of hardness. A felting machine and a three-dimensional felting process were developed for this purpose and transferred into a mono-material upholstered furniture concept by reinterpreting traditional felting techniques. The resulting stool demonstrates the range of properties and is the first of its kind.