For long trips, having enough clothes to change into is helpful, while washing or drying others. An extra pair of socks can be used as mittens. Shorts for swimming and fording streams are also useful. Wet clothes do not insulate as well and can freeze while a hiker is wearing them. If a hiker falls into ice water, an immediate dry change of clothes from a dry bag can be lifesaving. Layered clothing helps regulate body temperature in varying weather conditions.