Castelli Bike

Frequently Asked Questions

• How should Castelli bib shorts like the Free Aero or Progetto X2 Air Seamless fit?

  Castelli bib shorts should feel snug and contoured—close enough for mild compression to support muscles and keep the Progetto X2 Air Seamless or KISS Air 2 pad correctly positioned, but not so tight that they restrict pedaling or breathing. If the legs ride up or seams rub, try the next size or a different cut; use Castelli’s size guide and your chest/waist/hip measurements to choose the best fit.
• How does the Aero Race 6.0 jersey compare to a more relaxed Castelli option like the Maison?

  The Aero Race 6.0 is a race-oriented, body-hugging jersey built from low-drag, highly breathable fabrics for maximum aerodynamics and close fit, whereas the Maison is cut slightly looser for everyday comfort and longer rides. Choose Aero Race for time-sensitive efforts and packability; pick Maison or other comfort jerseys when you prioritize prolonged comfort and a bit more room on endurance days.
• Which Castelli jackets are best for variable wet and cold conditions: Alpha Doppio RoS, Beta RoS, or Alpha Flight?

  For the wettest, coldest conditions the Alpha Doppio RoS Jacket is engineered specifically for extreme Rain or Shine (RoS) protection, while the Beta RoS balances weather protection with lighter weight for mixed conditions. The Alpha Flight models focus more on high-performance insulation and breathability for very cold, high-exertion rides; layer with breathable base layers to manage ventilation across intensities.
• What technologies in Castelli gloves and base layers improve comfort and temperature control?

  Castelli integrates technologies like CDS (Castelli Damping System) and silicone palm prints for shock absorption and grip in gloves, while the Entrata line uses GORE-TEX® INFINIUM™ WINDSTOPPER® for wind protection. Base layers and jerseys use fabrics such as Magic Mesh, Core Mesh 3, Polartec® Alpha®, and moisture-wicking blends to move sweat, regulate temperature, and reduce odor on long rides.
• How do I choose Castelli gear for training, racing, and long endurance rides?

  Match cut and materials to the activity: choose race-fit items like Aero Race 6.0 jerseys and Free Aero bibs for racing and high-speed group rides, select durable, breathable pieces for daily training, and opt for slightly more comfort-oriented jerseys, bibs with KISS Air 2 padding, and weather-specific jackets (e.g., Beta RoS or Alpha Doppio RoS) for grand tours and long endurance days. Also consider intensity and climate—use thermal base layers or PrimaLoft® insulation in cold conditions and Magic Mesh/Core Mesh fabrics for hot-weather comfort.