Craft’s proCOOL Mesh Sleeveless Cycling Shirt is a base layer for biking in warm conditions. The super lightweight mesh undershirt ability to wick moisture and release body heat helps you stay cool and dry during intense physical activity. The mesh knit creates air pockets on the surface of the shirt that allow for maximum ventilation. Craft added an antimicrobial treatment to prevent odor from setting up a base camp underneath your pits.