There is an insane amount of energy and time spent to give helmets excellent air flow and aerodynamics. This, however, is less than ideal when the mercury drops. The Gore Bike Wear Universal Thermo Beanie fixes that downfall by employing proprietary fabrics to offer cold weather comfort. Thermo stretch fabric helps retain heat while pulling perspiration from the head to keep you warm and dry. The fabric is very low profile to easily fit under helmets, and it packs very small for stuffing in a rear pocket. The Gore Bike Wear Universal Thermal Beanie comes in ones size, and two colors, Black or Red.