Do I really need expensive down jackets?

Yes. At altitude, you aren't moving fast enough to generate constant heat, especially during breaks or evenings. A high-fill-power down jacket is the only thing that will keep you from shivering.

Can I bring my regular sneakers?

No. You need a lugged outsole for traction on loose scree and ankle support to prevent injury on uneven, rocky trails where help is often hours or days away.

Choosing Gear for High-Altitude Trekking

Prioritize a three-layer clothing system, broken-in boots with ankle support, and gear rated for sub-zero temperatures. Focus on weight reduction and versatility, as every extra ounce becomes significantly heavier above 3,000 meters.

Master the layering system. Use a moisture-wicking base layer (merino wool), an insulating mid-layer (down or synthetic puffy), and a windproof/waterproof outer shell (Gore-Tex or equivalent). Avoid cotton entirely, as it traps moisture and leads to rapid heat loss.
Select footwear by terrain, not looks. Choose mid-cut or high-cut hiking boots with a stiff sole for rock stability. Ensure you have at least half an inch of room in the toe box to accommodate thicker wool socks and account for foot swelling at altitude.
Test your sleep system. Bring a sleeping bag rated at least 10 degrees Celsius (18 degrees Fahrenheit) colder than the lowest temperature you expect. Use an insulated sleeping pad with an R-value of 4.0 or higher to prevent ground cold from stealing your body heat.
Prioritize sun and wind protection. UV radiation is significantly stronger at high altitudes. Pack category 4 sunglasses (polarized), a wide-brimmed hat, and high-SPF lip balm to prevent snow blindness and severe windburn.

Do I really need expensive down jackets?: Yes. At altitude, you aren't moving fast enough to generate constant heat, especially during breaks or evenings. A high-fill-power down jacket is the only thing that will keep you from shivering.
Can I bring my regular sneakers?: No. You need a lugged outsole for traction on loose scree and ankle support to prevent injury on uneven, rocky trails where help is often hours or days away.