Castelli Cold Days W 2nd ayer

Maximum insulation and moisture management for rides in cold weather, serving as an intermediate layer between the baselayer and jacket.

The Polartec® Alpha® material offers excellent insulation - soft, stretchy, and lightweight. A few years ago, we thought it would be great for baselayers, but it felt damp and clammy against the skin. In search of more warmth for our gravel rides in sub-zero temperatures, we tested the Alpha® prototypes as a second layer over a Prosecco baselayer and found the perfect combination for cold rides. We refined the details and perfected this second layer for chilly days. It features a half-length zipper that doesn’t add bulk around the belly area. The zipper is slightly off-center to avoid multiple zippers meeting at the neck. The fit is close to the body, allowing you the option to tuck it into your tights or wear it over them, as we do. It also works excellently over a Flanders, Bandito, Miracolo, or Seamless baselayer.

Active insulation made from Polartec® Alpha® 90 material from recycled PET with extra loft. Maximum breathability. Asymmetrical zipper. High collar.