With the Selun Top Women from Mammut, you might still work up a sweat. But because the top wicks away moisture, dries quickly and the fabric has an anti-odour treatment, this hardly bothers you. The front of the top is made from light and stretchy Polartec PowerDry, while the back is made from breathable polyester jersey. And because it has wide tank tops and no seams at the shoulders, it won't get in the way under rucksack straps.