Easy on the wallet, loaded with features. One of the standout features of Korkers wading boots, including the Greenback, is the interchangeable sole system. The Greenback comes with the OmniTrax 3.0 Interchangeable Sole System, allowing anglers to switch between different types of soles to adapt to different terrains. Soles include rubber, felt, and studded rubber options, providing superior traction on various surfaces.