A non-sterile device intended to help prevent a patient from cooling prior to, during, and after a surgical intervention by serving as a heat-generating cover. It is a highly hygienic device made of plastic material and designed with integrated pockets that hold air-activated warming pads containing various media [e.g., active coal, clay, or salt and iron (Fe) powder] that chemically generate heat when the device is removed from its sealed packaging. This is a single-use device.