Your review: I make car seat coolers and use the Ice-Brix for the cooling element. Each car seat cooler has 6 Ice-brix packs. I live in Arizona and the sun beats down fiercely here. On Sunday, I decided to test how long the cooler kept the car seat cool. Amazingly enough, it lasted from 8:30 am until 6:30 pm. No burning hot metal. Yeah!!!