Abstract. We construct several new classes of transcendental entire functions, f , such that both the escaping set, I(f ), and the fast escaping set, A(f ), have a structure known as a spider's web. We show that some of these classes have a degree of stability under changes in the function. We show that new examples of functions for which I(f ) and A(f ) are spiders' webs can be constructed by composition, by differentiation, and by integration of existing examples. We use a property of spiders' webs to give new results concerning functions with no unbounded Fatou components.