Arai XD-4 Helmet Review http://www.revzilla.com/arai-xd-4-hel... The Arai XD-4 is the newest generation of Arai Dual Sport Helmet. Offered in a variety of Solid and Graphic options, this newest edition gets an upgraded ventilation system, adjustable cheek pads, and a new visor system. Also one of the only DS helmets on the market that is Snell 2010 approved. If you are looking for a lightweight, high-end Dual Sport helmet you can wear all day, every day, look no further.