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Castelli Cold Days 2ND Layer - black 010

Castelli Cold Days 2ND Layer - black 010

The Polartec® Alpha® fabric is an amazing insulator, and it’s soft, stretchy, and lightweight. A couple of years ago we thought it would make an excellent fabric for a base layer, but it tended to feel wet and clammy against the skin. But when looking for more insulation for sub-freezing gravel rides, we tried using the Alpha® prototypes as a second layer on top of a Prosecco base layer — and stumbled into the best combination for cold riding.

Castelli worked on the details and created this second layer for cold rides. They have given it a half zip so it doesn’t create bulk over the lower torso, and we’ve mounted the zip slightly off-center to avoid the bulk of multiple zippers at the neck.

Castelli has kept the fit close to body so you have the choice to tuck it into your tights or leave it out like they do. They also found that it works well over a Flanders, Bandito, Miracolo, or Seamless base layer.


Maximum insulation and moisture management for cold rides, to layer between a base layer and a jacket.

Features of the Castelli Cold Days 2ND Layer:

  • Polartec® Alpha® 90 fabric high-loft active insulation made from recycled PET
  • Maximum breathability
  • Asymmetrical zip
  • High collar


Material 100% polyester

Характеристики Castelli Cold Days 2ND Layer - black 010

Fit: regular
Color: Black
Gender: men
Season: Winter, Spring/Autumn
Weight: 173g
Activity: Cycling
Material: 100% polyester
Item code: CST650806
Collection: Autumn/Winter
Model year: 2023
Compression: no
Manufacturer: Castelli
Product name: Castelli Cold Days 2ND Layer - black 010
Sleeve length: Long sleeve
Textile fabric: Synthetics
Usage bikesport: Road Bike
Manufacturer page: http://www.castelli-cycling.com
Upper clothing style: Short zipper