Freezing temperatures, wind, sleet, or snow are not an issue with the Yoder Smokers insulating thermal jacket, creating true efficiency during those colder winter months. Each jacket is designed with a five-layer construction to prevent heat loss that occurs as the temperature outside begins to drop, and therefore reducing pellet usage. Insulating the body of the cooking chamber, the thermal jacket is ideal for use at 300° and below. We recommend removing the three-piece thermal jacket for those cooks above 300°, as it was designed for smoking temperature ranges.