Lightweight insulation for freezing winter rides. The Castelli Cold Days 2nd Baselayer features breathable Polartec Alpha fabric to provide extra warmth and moisture management between your base layer and jacket. An off-center half zip reduces bulk for comfortable layering.

• Fit: Regular
• Weight: 176g
• Temperature Range: 17–41°F (-8 to 5°C), with layering
• Seasons: Winter, Early Spring, Late Fall
• Polartec Alpha insulation for lightweight warmth and breathability
• Off-center half zip prevents overlapping zippers
• Designed to layer between a base layer and winter jacket