Cat window hammock is made of breathable Oxford Cloth + Plastic, cat's body temperature won't overheat because of this cat window hammock breathability. In winter, add a mattress on this cat perch bed, this window mounted cat bed will be the most comfortable.
Also, because of low temperature, the suction cups maybe lose it’s power, you can soak the suction cups in lukewarm water a few minutes, and dry it. Please make sure there is no dirt or grease on the glass.