Castelli Cold Days 2nd Layer

Maximum insulation and moisture management for rides in cold weather, serving as a mid-layer between the base layer and jacket.

The Polartec® Alpha® material ensures excellent insulation - soft, stretchy, and lightweight. A few years ago, we thought it would be great for base layers, but it felt rather 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, leading us to the perfect combination for cold rides. We worked on the details and perfected this second layer for chilly days. It features a half-length zipper to avoid bulk around the belly area. The zipper is slightly off-center to prevent multiple zippers from 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, as we do. 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.