Castelli

#GIRO109 Sock 18

What Our Gearhead® Experts Are Saying:

"I use these for just about every ride. They’re lightweight, breathable, and hold their shape really well. The fit is snug without being restrictive, and they stay put even on longer efforts."

We rely on the GIRO109 Sock 18 as a foundational piece of our cycling kit, delivering consistent comfort, breathability, and fit across a wide range of riding conditions. Castelli uses a high-quality nylon-elastane blend to create a sock that balances durability with stretch, ensuring long-lasting performance through repeated use.

The technical knit construction enhances airflow, helping regulate temperature during high-output efforts, while maintaining a close, supportive fit that prevents bunching or slipping inside cycling shoes. This secure fit contributes to better pedal feel and overall comfort, especially on longer rides or during intense training sessions.

An 18cm cuff height provides a modern, race-inspired profile while offering light compression and staying firmly in place throughout the ride. Designed for seamless integration with performance footwear and apparel, this sock delivers the comfort and reliability needed for everything from daily training to competitive efforts.