The barely-there Pro Mesh 2.0 Sleeveless Base Layer is the second iteration of Castelli’s Tour de France winning base layer, made from light 3D mesh fabric for optimised moisture management in cool conditions.Unlike many base layers, it has a comfortable flat hem at the waist which won’t show under shorts, making it so unobtrusive that it can be paired with a Flanders Warm base layer on extra chilly days.Features:The sleeveless version of the base layer worn by castelliâs prosDesigned for a wide range of mild to cool conditionsMade from airy 3d mesh that disperses moisture with easeWith striking, sublimated print shadesInvisible under shorts, thanks to its flat hem