How to Pack Clothing for High Altitude in the Himalayas

Pack in layers using a three-layer system: moisture-wicking base layers, insulating mid-layers, and waterproof outer shells. Prioritize down insulation, merino wool, and synthetic materials that work when wet. Temperatures can swing 40°F in a single day above 12,000 feet.

  1. Start with moisture-wicking base layers. Pack 3-4 merino wool or synthetic base layer tops and bottoms. Avoid cotton completely—it kills when wet and cold. Merino wool regulates temperature and resists odor for multi-day wear.
  2. Add insulating mid-layers. Bring one down jacket (800+ fill power) and one synthetic insulation piece like a Primaloft vest. Down works better in dry conditions, synthetic when wet. Pack a fleece for active warmth.
  3. Pack waterproof outer shells. Include a hardshell jacket and pants with full zips for venting. Gore-Tex or similar breathable waterproof fabric prevents overheating during activity while blocking wind and snow.
  4. Prepare extremity protection. Pack liner gloves, insulated gloves, and waterproof shell mittens for a three-glove system. Bring a warm hat, sun hat, and buff or balaclava. Include 4-5 pairs of merino wool socks.
  5. Plan for temperature swings. Temperatures drop 3.5°F per 1,000 feet of elevation. At 15,000 feet, expect morning temps around 10°F and afternoon highs near 50°F in the sun. Pack to handle this 40-degree daily range.
  6. Test the layering system. Practice putting on and removing layers with gloves on. You need to be able to add or shed clothing quickly as conditions change throughout the day.
Can I rent gear instead of buying?
Yes, Kathmandu and Pokhara have excellent gear rental shops. Expect to pay $3-8 per day for down jackets, $2-5 for sleeping bags. Quality varies, so inspect items carefully. Popular items may be unavailable during peak season.
How much warmer clothing do I need compared to regular hiking?
Significantly more. Temperatures at 15,000 feet can hit -20°F at night even in October. You need gear rated 30-40 degrees colder than your home mountain hiking kit. The combination of altitude, wind, and low oxygen makes cold feel more severe.
What if my clothing gets wet during the trek?
Synthetic insulation and merino wool continue insulating when damp. Down loses all insulating power when wet. Always pack synthetic backup insulation and extra base layers. Dry gear inside your sleeping bag overnight when possible.
Do I really need three pairs of gloves?
Absolutely. Liner gloves let you handle gear and eat. Insulated gloves work for most hiking. Waterproof mittens are essential for snow, ice, and emergencies. Frostbite happens fast above 12,000 feet—redundancy saves fingers.