Women's short-sleeve base layers

so a thin knit with a breathable structure will beat even a more expensive fabric with a higher weight. Cotton soaks up moisture, stops drying, and cools you down in the shade more than you want. Under a backpack, notice where the seams run: a seam exactly under the shoulder strap will chafe your skin within a single day. Merino resists odour and is suitable for multi-day trips, while synthetics dry faster after every climb. A light colour heats up noticeably less in the sun.