Simply put, PatchFelt is colored BioFelt. BioFelt represents the un-dyed and natural color range of TrueFelt. The word ”natural” means that the felt is manufactured directly from sheep to felt without dyeing. What’s the Twist? BioFelt becomes PatchFelt when it is colored using safe and non-toxic colorants after being felted. The technique of coloring after being pressed into felt gives PatchFelt its characteristic handcrafted look.