Outdoor trousers are durable, comfortable and functional clothing products designed for outdoor activities. These trousers are generally produced for use in activities such as hiking, camping, mountaineering, cycling and are specially designed to provide freedom of movement to the user.

Outdoor trousers are usually made of waterproof, breathable and lightweight materials. The waterproof feature provides protection in rainy or humid weather conditions, while breathability increases the comfort of the user by wicking away sweat. These trousers often have durable seams and reinforcements at the seams so they can withstand harsh conditions.