HJC RPHA 11, F70, I90, I100 PINLOCK 70, 120, PT MAX VISION ANTI FOG VISOR INSERT

You're not the only one that gets frustrated with wearing a steamy visor! Simple to use. Fog Performance Level: Pinlock 70,120,PT. Built-in pins on the shield along with the Pinlock anti-fog lens transforms your single shield into a dual shield that will resist fog buildup.

eBay