Castelli Mens Core Mesh Short Sleeve Summer Baselayer

THE NEXT-TO-NOTHING BASE LAYER
This is the perfect minimalist piece to keep you cool in warm weather. The fully open mesh serves mainly to hold the jersey off the skin, creating a layer of air between your skin and the jersey to help you maintain a constant body temperature.

The fabric absorbs practically no moisture, and it weighs next to nothing so it won’t weigh you down.