Heat-insulating, technical, sporty - and with high comfort: The UYN(R) AMBITYON UNDERWEAR SHIRT LONGSLEEVE impresses with its effective climate management and optimal fit. Its material, Natex, 100% organic based fibre, is soft on the skin and dries very fast. In combination with Coolvent, three-dimensional channels for optimal air circulation, the shirt absorbs sweat and keeps skin dry. Winter sportsmen are protected from cold at all times thanks to Heatmemory. Because it has particularly high insulating properties, especially for sports activities on cold days. There's also the innovative Hypermotion cut: Made of one piece in the shoulder and arm area, it allows maximum freedom of movement.