This book is devoted to the static properties of flexible polymers in solution, presenting the vast theoretical and experimental progress made in recent years. Work in this area has been especially fruitful because long polymer chains show a universality in their behavior when in solution, despite the variety in their chemical composition and physical properties. The authors include the results of new experimental techniques such as photon and neutron scattering, and the use of computer simulations. This work is the result of a collaboration between a theoretician and an experimentalist, who have both worked for many years on polymer solutions.