Packing for High-Altitude Trekking in the Himalayas

Layering is your only strategy for surviving the extreme temperature swings between sunny afternoons and sub-zero nights. Pack a moisture-wicking base, an insulating mid-layer, and a high-loft down jacket to handle altitudes up to 5,500 meters.

1. Build your base layer. Carry two sets of merino wool or synthetic base layers (top and bottom). Avoid cotton at all costs; it holds moisture, stays cold, and leads to hypothermia in high-altitude winds.
2. Select your mid-layers. Bring one thick fleece or wool sweater for active movement and one heavy-duty down or synthetic parka (rated for -10°C or lower) for when you stop moving or arrive at camp.
3. Prioritize your shell. You need a high-quality, breathable, waterproof hardshell jacket and windproof pants. High-altitude weather changes in minutes; a flimsy windbreaker will not cut it at 4,000 meters.
4. Protect your extremities. Pack two pairs of thick wool trekking socks, one pair of glove liners, one set of heavy insulated waterproof mittens, and a beanie that covers your ears entirely.

Do I really need a down jacket? It takes up so much space.

Yes. Even in the trekking season, evening temperatures at high-altitude teahouses often drop well below freezing. You will not survive comfortably without it.

Can I wash my clothes on the trail?

Technically yes, but it is highly discouraged. Cold water temperatures and low humidity mean clothes won't dry, and wet clothes at altitude are dangerous. Pack enough sets for the duration.