Styles include trousers/pants, apron-wrapped chaps and simple chaps. Each has pros and cons. Simple chaps may be lighter, but do not protect the backs of your legs. Buckling and strapping systems should feature ease of use, durability, adjustability and should not easily hang up on brush. Weight matters, especially when they'll be used in hot weather and sweaty conditions. Consider whether you might want to wash them. Choosing the right style for your intended use will significantly increase your margin of safety.