A base layer keeps you cool and dry in the warmer months. If you wear the Castelli Pro Mesh Sleeveless underneath a cycling jersey you will stay cool and dry. The 3D mesh fabric reduces skin contact so a woman cyclist dries almost instantly. This lightweight construction doesn’t carry any excess weight if you want to ride up a mountain or do anything where weight matters. At the waist a hem keeps the sleeveless base layer close to body so it easily tucks into a pair of cycling shorts and you ride comfortably as you stay dry.