The Castelli Pro Seamless arm warmers were developed in collaboration with World Cup cyclists to offer a better design for cold days.

Wet gear is often uncomfortable and can affect performance by adding extra weight. Many warmers use a nylon/Lycra blend that tends to retain moisture, but Castelli demonstrated its innovation by introducing polyester into the unique fabric used for the Pro Seamless Warmer series. Their breathability, excellent heat-to-weight ratio, and comfort have quickly made them popular among professional cyclists.

• Medium-weight arm warmers with no seams;
• Expected to be warm without causing overheating;
• Unique polyester/nylon/Lycra blend: 78%/15%/7%;
• Completely seamless construction;