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Stay cool and comfortable on hot days with the Castelli Active Cooling Sleeveless Undershirt in Silver/Grey. This base layer is designed to actively cool you through evaporative cooling, using hydrophilic and hydrophobic yarns to hold moisture close to your skin while allowing airflow. The Polartec Delta fabric regulates drying to keep you cool, making it perfect for pairing with breathable jerseys like the Climber’s or Superleggera. With a lightweight design and stylish sublimated overprint, this undershirt is a must-have for any cyclist looking to beat the heat.