A rain jacket is essential if you hike in wet weather. It should be waterproof and breathable, with features like a hood, pit zips and sealed seams to keep out moisture. Look for jackets made from nylon or polyester with a waterproof coating. For cold weather, you'll want an insulated jacket to trap your body heat. Down insulation is warmer than synthetic fill, but it's less water-resistant — synthetic insulation performs well even if it gets wet. A hard shell jacket is made for harsh weather conditions. These hiking jackets are waterproof, windproof and breathable.