Thoughtfully constructed to provide protection under a helmet, Outdoor Research's Helmetclava keeps you warm in stormy conditions. WINDSTOPPER Soft Shell fabric is used where the worst of the weather hits your face and front of the neck. Soft, insulating Motion Fleece at the back of the neck provides added warmth. Thermodynamic fabric at the crown and ear panels fits smoothly under a helmet without bulk and doesn't block sound from traveling to your ears so that you can hear everything your partner communicates to you. A laser die cut breathing port and breathable fabric allows body heat and the moisture of breath to escape.