Because bike helmets aren’t known for their warmth, this skull cap comes in handy on cold mornings. Layer it under your helmet to stop your ears from burning in the brisk morning air.
- Made of cozy warm Thermoflex fleece that stretches
- Flatlock 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
