Castelli Cold Days Second Layer 2026 long-sleeved cycling base layer

It’s -5 degrees or colder, and you don’t want to go home freezing – this long-sleeved base layer is just what you need. Designed to be worn between a standard base layer and a jacket, this Castelli Cold Days Second Layer guarantees maximum insulation thanks to its Polartec Alpha 90 construction, an incredibly insulating fabric.

Soft, stretchy and lightweight, this long-sleeved base layer offers excellent moisture management whilst keeping your torso warm and dry. Despite a slightly loose fit, this Castelli Cold Days Second Layer remains close-fitting so it slips easily under a jacket, allowing you to ride in temperatures between -8 and -5 degrees in the depths of winter.

Technical specifications:

- Colour: blue
- Sizes: XS to 3XL
- Weight: 101 grams (size M)
- Temperature range: -8 to -5 degrees
- Polartec Alpha 90 made from recycled PET
- Maximum breathability
- Asymmetrical zip
- High collar

Castelli size guide