We have been having a couple of hot days with real high humidity. I mean days with the air conditioner on high and its still 80 degrees and 65% humidity inside. And even though Maxx is a indoor cat, (she never go outside without her carrier) with that kinda humidity she gets very warm. So Ive been putting Sadie's old Cooley on her. It is Sadie's Cooley from last year so its getting a little small for her now, (Sadie was only a pup last year)and it seems to fit Maxx quite well. Even though you have to soak it in water for it to stay cool, Maxx kinda likes it. She thinks its like one of her ties or her collar,( its one of her O.C.D things) and it also keeps her a little cooler too. We got Sadie a new one, so she has one that fits better.