Safety Clothing and Personal Protective Equipment Design A-circle life buoy by Zhang Yahan When shipwreck happens, people have to abandon ship for survival and the cold seawater is always the No.1 killer of causing death. In this case, maintaining the body temperature of drowning people is the principle problem to be solved. Two-layer thermal insulation materials can isolate seawater effectively, prevent hypothermia and cut off harmful pollutants over the sea. This type of life buoy isolates wounds to prevent sharks attacks. In addition, it is equipped with GPS and the luminous device that are helpful to find victims quickly and precisely to ensure rescue in the shortest time.