The Icon Mainframe helmet was designed with fit, function, and the rider's safety in mind. The Mainframe helmet features a venturi super-vent system for the ultimate in airflow. Athree position forehead switch acts as an additional ram-air vent to significantly increase the overall cooling of the helmet. The shell is constructed of a Dyneema/fiberglass composite and is lined with a dual-density styrene liner for incredible strength without undue weight. Also incorporated into the design are removable/washable cheek pads, a removable anti-fog breath deflector, and the industry's easier no-tool quick change shield.

• Dyneema/fiberglass composite shell for strength
• DOT and Snell M2005 approved (North America) ECE 22.05 approved (Europe)
• Super-vent venturi cooling system
• Secondary ram-air forehead vent
• Fully removable/washable cheekpads
• Internal on/off cheek exhaust switch
• Removable molded breath deflector reduces shield fogging
• Positive-lock chin venting system helps prevent fogging
• Optically correct polycarbonate 7-position shield offers safe, clear vision and easy no-tool replacement system
• The DFA helmet comes with an additional reflective rst green shield

1. Wrap flexible tape measure approximately 1 inch above eyebrows and ears
2. Use this measurement to find your size on the chart below

   	Hat Size	Measurement
   X-Small	6 5/8 - 6 3/4	20 7/8 - 21 1/4
   Small	6 7/8 - 7	21 5/8 - 22
   Medium	7 1/8 - 7 1/4	22 3/8 - 22 3/4
   Large	7 3/8 - 7 1/2	23 1/3 - 23 1/2
   X-Large	7 5/8 - 7 3/4	24 - 24 3/8
   XX-Large	7 7/8 - 8	24 3/4 - 25 1/8
   XXX-Large	8 1/8 - 8 1/4	25 1/2 - 26