A cold plunge, also known as a cold immersion or cold water immersion, is a practice that involves immersing the body or parts of the body in cold water, typically at temperatures below 50°F (10°C). This practice is often used for its potential health and wellness benefits. Here’s a closer look at what a cold plunge entails: Overall, a cold plunge is a therapeutic practice with a range of potential benefits, but it should be approached with caution and awareness of individual health conditions.