The professionals Castelli works with know how important it is to have the right undershirt for a wide range of conditions. The Castelli Pro Mesh Sleeveless covers a wide range and will keep you dry in cool to mild conditions. In really cold weather, you can even wear it under a Flanders Warm undershirt as a first layer. With the jersey zip open, you can show your colors and show that you are not wearing an ordinary undershirt.
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