Mammut does not provide a temperature rating for their Eigerjoch Advanced IN Hooded Jacket. It is designed for Mountaineering, and Ski Touring. It features a blend of two types of insulation. Premium water-repellant goose down from Responsible Down Standard suppliers keeps your upper arms, core and hood interior nice and warm. The exposed and high-perspiration spots, such as the shoulders, hood, back and underarm sections are made with soft, stretchy PrimaLoft Gold Insulation Active synthetic fiber material. For more information, I would recommend reaching out to the manufacturer directly.