I used this only once in August, when it was the height of summer. It didn't seem to work then, but now that it's cooler, it seems to be effective when I touch it. I don't have any plans to go out anymore, so I'd like to pass it on to someone who will use it. Flower-shaped cooling sheet that attaches to a hat and cools naturally below 28°C. - Product Name: Hat Cooler - Features: Cools naturally below 28°C - Design: Flower-shaped cooling sheet - How to Use: Attaches to a hat Thank you for looking.