CASTELLI Men’s Core Mesh 3 Sleeveless, Lightweight Breathable Base Layer for Hot Weather Cycling, Quick-Dry Riding Undershirt

Castelli believes so much in the power of the fabric it uses to craft the Core Mesh 3 Sleeveless Baselayer that it deviated from its usual performance-related fabric monikers and named it Magic Mesh. Before you get skeptical about the fabric's otherworldly name, consider that the brand omitted all traces of less breathable Lycra when constructing the mesh, using only the most breathable polyester fibers to ensure maximum moisture management. By putting this featherweight layer under your summer jersey, you'll actually help speed up the rate at which moisture is pulled away from your skin to evaporate, helping you stay cooler and drier as you push through hot, humid air.

• SIZING: Castelli products have a close-to-the-body fit to maximize aerodynamics and performance. For a less compressive feel, or if your measurements fall between sizes, we recommend that you size up.
• IDEAL FOR: Performance cyclists seeking maximum ventilation and sweat control during intense rides in hot climates. Ideal under a cycling jersey for summer training, racing, or indoor workouts. Temperature: 20°C - 40°C / 68°F - 104°F. Weight: 117 g.
• ULTRA-LIGHT BREATHABILITY: Constructed with open Magic Mesh fabric that promotes continuous airflow between skin and jersey, preventing overheating during long climbs, fast group rides, or turbo sessions.
• SLEEVELESS FREEDOM: The minimalist sleeveless design enhances upper-body mobility and reduces bulk under race-fit jerseys. Perfect for high-output efforts where unrestricted movement and cooling are essential.
• MOISTURE-WICKING PERFORMANCE: Made from 90% polyester and 10% elastane for superior stretch and moisture transfer, this quick-dry cycling base layer efficiently pulls sweat from the skin—keeping you cool, dry, and comfortable mile after mile.