Natural Dye, Chemical, Trail running, Sportswear, Sustainable, Pigments, Chromatic, Toxins, Print, Dye, Dirt. Sammanfattning på engelska: This work explores natural dye’s ability to be used for trail running wear. The sustainable aspects in the clothing industry includes the production of nontoxic textiles that do not pollute in the production process nor when using the textile close to our bodies. Natural dyes usually have low toxicity and are produced from renewable resources. The explorative nature of trail running is used as a guideline and an entrance exam for the dyed fabrics to prove wash- and lightfastness durable for the sport. The idea of colouring clothes directly with nature is present in dirt prints printed with natural pigments. Organic printing with rust and vegetable oil is explored as an alternative to screen printing. The movements and comfort of running outdoors is understood by body indicated experiments as a method. Pattern construction is made from movement and sensation by exposing the body to friction, dirt and cold air. The results of these experiments were together with reshaping existing run wear the construction method. This work suggests viewing colour as nonstatic and with more dimensions such as locality and smell. By using slow dye processes and locally accessible dye materials unique expressions from natural dyes, prints and patinations can enhance sportswear in the appearance, health and environmental aspect.