Because bike helmets aren’t known for their warmth. This skull cap comes in play on cold mornings. Layer it under your helmet and to stop your ears from burning in the brisk morning air.
- Made of cozy warm Thermoflex fleece that stretches
- Flat locked seams won't bunch or chafe
- Raw-edge hem lies flat under a helmet
- Castelli recommends this hat for temperatures between 0 and 12°C
