Our original Difesa cap is a GORE-TEX INFINIUM™ WINDSTOPPER® piece that's best for extreme conditions. With the Difesa Thermal we take away the windproofing, but by doing so dramatically improve the moisture management, so it's best for cool to cold conditions, especially with high-intensity riding. We place a rib-knit wool wrap around the ears to keep you warm but keep it all relatively thin to fit under a helmet.