Final answer:
In mountainous regions, people wear layered clothing, thermal base layers, insulated middle layers, and waterproof outer layers along with accessories like gloves and hats to protect against the cold and variable weather conditions and maintain body heat.
Step-by-step explanation:
When in mountainous regions, it's important to wear protective clothing to safeguard your body against the cold and variable weather conditions. The thin air at high elevations can strain the human respiratory system, making proper attire essential. Mountaineers often wear layered clothing made from materials that insulate heat and repel water. For example, a base layer of thermal wear, a middle layer such as fleece for insulation, and an outer layer that is waterproof and windproof is ideal. Accessories like gloves, hats, and sturdy boots are also important. These clothing choices are designed to maintain body heat, ensure dryness, and provide safety during your mountainous adventures. Additionally, wearing sunglasses and applying sunscreen is crucial to protect against the sun's UV rays.