Ultralight base layer to withstand the heat. If nothing keeps you indoors on hot days, you need this short-sleeve shirt. It is made from our lightest material for functional underwear: the highly elastic, temperature-regulating fabric with a subtle dot pattern ensures a cool, dry feeling even in high temperatures. Ideal for running, hiking, or whenever you want to keep your cool in the heat. Thanks to the seamless construction, you enjoy smooth comfort – nothing can hold you back. Made for peak performance in summer conditions.