Castelli Nano Thermal Cap black

A traditionally shaped cycling cap but with extra warmth and water protection from Castelli's Nano Flex 3G fabric. It fits comfortably under a helmet with minimal bulk but adds significant warmth for cold rides. This cap provides a high degree of warmth, especially in temperatures close to freezing and for riders who tend to sweat a lot and need the breathability of Nano Flex. If you're riding in extremely cold conditions, then look to the Estremo WS Cap.

Nano Flex
Castelli take their thermal fleecy stretch Thermoflex fabric and coat it with millions of tiny nanofilaments to create the most water-repellent fabric finish ever. Drops of water stay as spherical balls on top of the fabric or bounce off the fabric without leaving a trace.