Argon is a safe, benign gas traditionally used to preserve wine, meat and historical documents. A spokesman for Safeway said last week: "This is as much for safety and quality as it is for ...

On a graph on its website, the company shows that 4.5 mm of argon insulates comparably to 14 mm of solid insulation.You stay warm with less bulk, and because the warmth is from gas, you don't get ...