There are a lot of options for anti-fog products, but which ones are wheat and which ones are chaff? To find out, we asked our friends at Rockview Farms in Downey, CA, to borrow a corner of their sub-40-degree warehouse. Among the crates of icy-cool milk, cream, and seasonal eggnog, we gathered a handful of anti-fog products and a pile of standard face shields (with no anti-fog coating). Our methodology was simple. Each product was applied to the left half of the shield, while the right side was left untreated. Then we donned the helmet, breathed normally for 60 seconds, and waited for the magic to happen. In most cases, results were obvious within 20-30 seconds, and after 45 seconds the control side of the shield stopped accumulating fog.