Trekking in Nepal exposes you to a wide range of temperatures and weather conditions, from warm valley mornings to chilly high-altitude evenings. Proper layering allows you to stay comfortable and safe throughout the journey. Start with a moisture-wicking base layer to keep sweat away from your skin, add an insulating mid-layer like fleece or down for warmth, and finish with a waterproof and windproof outer layer. This system makes it easy to adapt to changing conditions while keeping you dry and warm.