The Pearl Izumi AmFIB Lite Skull Cap is for someone who typically rides through winter and wants extra protection. It has Polartec Wind Pro fabric on the leading edge to help block wind combined with a highly breathable mesh fabric on the top and back to keep you from overheating. This cap is designed to fit under your helmet easily and comes down enough on each side for crucial ear protection. It even has a port in the rear for anyone with a ponytail to ride more comfortably. The Pearl Izumi AmFIB Lite Skull Cap is a must-have addition to your cold-weather cycling gear.