What Makes the Pro Mesh M Sleeveless the Best Base Layer?

The Castelli Pro Mesh M Sleeveless Base Layer is built on the same foundation as the base layers trusted by WorldTour pros. Its 3D open-mesh construction wicks sweat off your skin and pushes it outward to your jersey so you stay dry and comfortable on long efforts. The sleeveless cut eliminates bulk at the shoulder while keeping core temperature regulated during hard rides. If you have ever finished a ride soaked through a regular shirt, this is the antidote.

Made from 100% polyester mesh with flatlock seaming throughout, this base layer is engineered to sit close without compressing or binding. It layers seamlessly under any cycling jersey and washes easily without stretching out of shape. The black colorway stays invisible under dark jerseys and resists visual wear over time. Ideal for road and gravel riders who prioritize thermoregulation and moisture management on four-season training rides.