Helmetclava Black – Medium. Thoughtfully constructed to provide protection under a helmet, the Helmetclava keeps your neck and head warm in stormy conditions. WINDSTOPPER® Soft Shell fabric is used to protect the face and front of the neck, and soft, insulating Motion Fleece™ positioned at the back of the neck provides added warmth. Thermodynamic™ fabric at the crown and ear panels fits smoothly under a helmet and improves h