Since being launched in 1984, the versatile RF series has become Shoei’s most successful line of helmets. The tried-and-true RF series of full-face helmets takes its next evolutionary step with the new RF-1400. Photo by Kevin Wing. Like the RF-1200 it replaces, the RF-1400 uses Shoei’s proprietary Multi-ply Matrix Aim+ construction, a shell made up of interwoven layers of organic…