The Stilo ST4W Zero, Arai GP6 RC, Stilo ST4W GT, Arai GP6 PED and Bell RS7 are highly recommended, according to Winding Road. These helmets range from $1300 to $5600 and meet automotive racing standards.
The Stilo ST4W Zero is an extremely light carbon fiber helmet with communication and hydration features. The Arai GP6 RC is a carbon helmet and has additional components for open-cockpit racing. The Stilo ST4W GT is a slightly heavier carbon fiber helmet with an included facemask. The Arai GP6 is a polymer-based helmet which offers comfort but has a narrow eye port. The Bell RS7 is a lower-cost, entry-level carbon fiber racing helmet.