I sometimes bring my bow to work to bring it to the pro shop at lunch time and leave in a hard plastic case in my car trunk or back seat. If it's very warm out like you described, I will put a towel over the case with several ice packs from the freezer spread out over it and then another towel. I have felt the bow after leaving all day and it is not warm at all so this method works. My wife thinks this is amusing, but it doesn't take much effort and it protects the bow.