Based in Mira de Aire, central Portugal, Rosários 4 specializes in the production and dyeing of textile yarns (knitting, crochet and embroidery). The development of innovative and value-added products and priority to natural fibres or from natural origin alongside an unquestionable quality customer service are a few of the principles that motivate Rosários 4, driving the company onto an incessant path of improvement. As a result, Rosários 4 has been certified since 2000 by the ISO 9001 Quality Standard, since 2018 by GOTS, and since 2024 by the VEGAN Standard.