Castelli Cold Days 2nd Layer

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

The Polartec® Alpha® material provides excellent insulation - soft, stretchy, and lightweight. A few years ago, we thought it would be great for base layers, but it felt damp and clammy against the skin. However, when we were looking for more warmth for our gravel rides in sub-zero temperatures, we tried the Alpha® prototypes as a second layer over a Prosecco base layer - and that led us to the perfect combination for cold-weather outings. We worked on the details and perfected this second layer for chilly days. We added a half-length zipper to prevent bulk around the belly area. Additionally, we positioned the zipper slightly off-center to avoid multiple zippers meeting at the neck. We kept the fit close to the body, giving you the option to tuck it into your tights or wear it over them, as we prefer. We also found that it works excellently over a Flanders, Bandito, Miracolo, or Seamless base layer.

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