The Biomorph functional shirt with stand-up collar by UYN is your go-to thermal base layer for cold-weather performance. Made from innovative bio-based fibers, it offers excellent breathability and strategic insulation to keep you warm where it counts. Functional zones target sensitive areas, while the elastic material ensures total freedom of movement. Whether used as ski underwear, for winter workouts or touring – this thermal shirt from UYN combines top performance, sporty comfort, and a modern design. Choose sustainable functional underwear built for your active lifestyle.