Castelli Core Seamless Base Layer White SM/MD

The Castelli Core Seamless Base Layer White SM/MD is a soft, ultra-lightweight first layer engineered from a polyester and polypropylene blend that rapidly moves moisture away from the body. Its seamless construction delivers exceptional stretch and next-to-skin comfort while offering effective temperature regulation in mild to cool conditions, making it ideal for multi-hour rides between 15 and 25C.