We've been using an old hat similar to the video, but we also put a gel icepack in it and a cooling towel over the camera. A bit tedious to setup in the beginning but it's lasted through triple digit heat with that combo.
I posted a video earlier in this thread when my daughter was throwing out her first runner in 10u. Now she's 10 and playing up this Fall in 12u and threw out 5 girls this past Sunday over 2 games. She's tiny since she's playing up so I guess the opposing coaches like to test her?
Love the videos posted in this thread. My daughter is only 9, so she gets inspired watching all of the older girls in those videos.
Here was her last year at age 8 throwing out her first runner in 10u (she played up that year).