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, elastic, 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 - and thus found the perfect combination for rides in the cold. We worked on the details and perfected this second layer for chilly days. It features a half-length zipper to avoid bulk around the stomach area. We also placed the zipper slightly off-center to prevent multiple zippers from 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 do. 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.
Clothing size  | 3XL  | 
Material composition  | Polartec® Alpha® material made from recycled PET with extra strong loft  | 
Target group  | Men  | 
Item number  | 25227427 | 
Manufacturer  | Castelli | 
Category  | Functional undershirts | 
Release date  | 19.4.2023 | 
Colour  | Black  | 
Exact colour description  | Black  | 
Material composition  | Polartec® Alpha® material made from recycled PET with extra strong loft  | 
Target group  | Men  | 
Age group  | Adults | 
Clothing size  | 3XL  | 
Season  | Winter  | 
CO₂-Emission  | |
Climate contribution  | 
Weight  | 101 g | 
How often does a product of this brand in the «Functional undershirts» category have a defect within the first 24 months?
Source: Digitec GalaxusHow many working days on average does it take to process a warranty claim from when it arrives at the service centre until it’s back with the customer?
Source: Digitec GalaxusUnfortunately, we don't have enough data for this category yet.
How often is a product of this brand in the «Functional undershirts» category returned?
Source: Digitec Galaxus