Windbreakers and waterproof jackets are both designed to protect you from the elements, but they serve different purposes. They are made from lightweight materials and are meant to be worn in milder weather or during activities like hiking or running, when you need protection from the wind but don’t need the extra warmth of a heavier coat. Waterproof jackets are made from thicker, more durable materials and are meant to be worn in colder weather or in wet conditions, when you need to be protected from both the wind and the rain.