This a dangerous condition where you body temperature drops way below your normal temperature. You can get this by being out in cold weather for too long and not being dressed well enough. Or, by being in cold water for too long, or getting wetand being in cold air for too long. This can happen in both winter conditions or even in summer. Always let adults know where you are going and stay with a buddy when ice fishing to help you in case you break through the ice. This is also good advice when fishing or swimming in the summer time. If you are with someone who gets wet and cold, cover them with a dry blanket, coat, or other items to keep them warm until they can get somewhere safe and warm.