Trips to high-altitude snow locations such as Sela Pass, Bum La and the lakes around Tawang require more protection than sightseeing at lower elevations. Pack for freezing temperatures, wind, snow and rapidly changing mountain weather, even if conditions in Tawang town feel relatively comfortable.
Use a layered clothing system rather than relying on one heavy jacket. Thermal tops and bottoms, a fleece or wool mid-layer and an insulated outer jacket provide adjustable warmth. Add warm trousers, gloves, a woollen cap, a neck warmer and several pairs of warm socks.
Footwear should provide both warmth and traction. Water-resistant or waterproof boots with a good tread are useful on snowy or icy ground, while smooth-soled shoes can become slippery. Sunglasses, sunscreen and lip balm are also worth carrying because reflected sunlight and dry mountain air can be uncomfortable at high elevations.
Keep a small day bag with water, snacks, essential medicines, a charged phone and a power bank. Carry your identification and required permits in an accessible, protected place. If using a camera, bring spare batteries because cold conditions can shorten battery life.
Avoid packing so much that moving around at altitude becomes tiring. Keep the warmest layers and essential items inside the vehicle or day bag rather than buried in your main luggage, and take symptoms such as headache, dizziness, nausea or unusual breathlessness seriously during high-altitude excursions.