New this summer, this hygrophobic short sleeve T-shirt is designed for the keen mountaineer and built for alpine environments as well as everyday adventures. Expert Series. Base Camp short sleeve T-shirt is designed for the keen mountaineer and built for alpine environments as well as everyday adventures. From the Expert Series, it features the route to the south face of the Anapurna. The Polartec® Power Dry® High Efficiency fabric has outstanding breathability performance, optimizing moisture management. Designed to keep you dry, even when you sweat, it dries quickly and features a POLYGIENE® anti-odour technology (BLUESIGN® certified) to restrict bacterial development, making it ideal to wear for high levels of exertion, as an underlayer to complement a protective shell, on alpine treks, hiking sessions and as a stand-alone piece, for everyday comfort.