Castelli's warmest winter cap has gore-tex infinium™ windstopper® protection on the front-facing surfaces, while we let sweat escape out the back with warmer fabric. It's thick enough to provide warmth but takes minimal space under the helmet.
- Gore-tex infinium™ windstopper® x-fast on front blocks wind
- Warmer fabric on back for breathability
- Cut to fully cover ears for warmth
