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
Size Range - Uni Size
Weight - N/A
Comfort range 0c -15c
Fabric - 86% Polyester 14% Elastolefin (Olefin)