In the winter time, cooler heads definitely do not prevail. That's because most heat is lost through your head. The Pearl Izumi Thermal Skull Cap is a cycling helmet liner that helps you retain heat, without soaking through with sweat or accumulating some funky smells.
P.R.O. Thermal fabric uses Minerale polyester with embedded volcanic minerals to insulate, wick away moisture and reduce odors
Ponytail opening at the back to accommodate longer hair and Euro-mullets