PEARL IZUMI AmFIB Lite Skull Cap - Black - O/SRide through winter in more comfort with the AmFIB Lite Skull Cap. This cold weather essential uses Polartec Wind Pro fabric on the leading edge to block the wind and highly breathable thermal fabric on the top and back to keep you from overheating. Its designed to fit easily under your helmet and comes down enough on the sides for crucial ear protection. It fits comfortably under a helmet and a port in the rear allows ponytails to pass through.