Chapie utilizes aerospace engineering to keep your lip balm cool! You can think of Chapie as a shell within a shell. The spaces between the shells are vacuumed out so no hot air can transfer between the containers. Chapie is leak proof and waterproof which means even if your chapstick melts in the dryer, it won't get all over your clothes! Here are some essential tips to keep your lip products from melting! Keeping your Chapie in the shade is the best way to keep it cool! We do not recommend that you leave your Chapie OG or Plus in your car. Cars can become 50F+ degrees warmer than outside due to the greenhouse effect. Chapie OG and Plus work best on a key chain! When you have your Chapie on a key chain it generally stays out of the direct sun and doesn't get left behind in cars. Since you need your keys to start your car, you will always have a chap stick in your car!