Sometimes the best ideas are the simplest, take the Castelli Viva Thermo Skully, a simple headband with a shaped upper stitched high up and a raw cut edge just a couple of seams and non in critical places means supreme comfort and warmth with a minimum of bunching weight or bulk. Ideal in all winter conditions fitting comfortably under a helmet. A Garmin Cervelo team version is also available for team fans.
Thermoflex is warm, soft and stretchy.
Raw cut edge lies flat and doesn't bunch under your helmet.
Buy Castelli Viva Thermo Skully from Chain Reaction Cycles, the World's Largest Online Bike Store