Large sizing is designed to fit over helmets. Model is wearing a medium sized helmet. Zippered rear vent that can be opened or closed to regulate temperatures. Vent is also compatible with anti fogging gear to allow airflow through the helmet. Extra warm polar fleece (300 GSM) combined with ventilation vent makes this hood perfect for a wide range of conditions. Drawstrings on the hood allow adjustment to fit all sizes. Shred the slopes in warmth and style this season, with the Snood Balaclava, which is designed to fit over your helmet to offer maximum warmth with a rear zippered vent that can be opened or closed to regulate temperatures. Vent is also compatible with anti fogging gear as it allows airflow through the helmet. Adjustable face mask can be folded up or down depending on weather conditions.