Vapor Mesh™ technology makes Primus Winter Gas the fastest sub-zero boiling canister fuel available. It increases the speed of vaporization from liquid to gas, with the inclusion of an absorbent paper insert that increases the surface area available for liquid fuel to evaporate into a gas state. That means a higher pressure that allows the burner to consistently receive more fuel, resulting in a stronger flame that cuts down boiling time in low temperatures, and overall better cold-weather performance. The best part, the effect of the Vapor Mesh increases as fuel level decreases.