The Castelli Pro Issue Sleeveless Base Layer is ideal for mild to warm conditions. It wicks moisture away from the skin as you ride, leaving you feeling drier and more comfortable.
This isn't a thermal base layer, just something to move the moisture away from your body and help your race jersey to perform.
Castelli's 3D mesh fabric creates space near your skin to encourage air circulation and heat dispersal, while the polyester capillary action moves sweat away.