When you step into the Himalayas, your jacket is your shield against cold winds, snowfall, and unpredictable mountain weather. The right trekking jacket keeps you warm, dry, and comfortable — but with so many options (down, synthetic, fleece, waterproof shells), choosing can be confusing. Here's all that you need to know about trekking jackets — from waterproof vs synthetic vs down jackets, to proper layering, care, washing, drying, and storage. Learn how to choose the right jacket for your Himalayan adventure.