Freezable bongs are a unique type of water pipe designed to enhance the smoking experience by cooling the smoke before it reaches your lungs. These bongs typically feature a freezable glycerin coil or chamber that can be placed in the freezer before use. When you smoke through a freezable bong, the cooled smoke is smoother, less harsh, and more enjoyable, making it a popular choice for smokers who want a cooler, more refreshing hit.