Outdoor Research Helmetclava – Medium: Thoughtfully constructed to provide protection under a helmet, the 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.