The ReuSIX project has the ambitious goal of making hosiery and underwear and sportswear apparels, produced by circular knitting technology, with recycled raw materials developed with the aim of reducing the environmental impact of downstream processes, especially dyeing and finishing. These products will also be made, adopting an ecodesign approach, and thanks to materials engineering with the aim of being able to be reclyed at the end of their life back to new raw materials capable of feeding the production chain upstream again, without any impact on the chemical and physical characteristics of the new 2nd generation threads and garments (ie cradle to cradle circular economy).