When sport is part of your daily life and you spend all your weekends outdoors, you need the right kind of base layer–a high performance base layer like the Mens Crosstrail Long Sleeve Top from Jack Wolfskin. This functional top is a true all-rounder and is suitable indoor or outdoor training. As soon as you slip it on, you'll appreciate just how soft and comfortable It is . It is super breathable too, of course, and dries fast after those sweaty sprints. When it's warm, the fabric has a cooling effect and the stay-fresh properties reduce unpleasant odours.