Castelli Viva Thermo Headband

For those days when a full skully would be a bit of overkill, but the wind is still nipping at your ears, the Viva Thermo Headband makes a perfect go-to. The fleece-lined ThermoFlex material that comprises it is warm and soft, stretching easily to accommodate a wide variety of domes, yet it's also especially breathable and never lets you overheat. It's raw-cut edges don't bunch and won't apply pressure points to your head under your helmet, making this light cap something you'll almost forget it's there -- until you take it off, of course.