Choose the Aluminum lightweight crampons for hiking and trail running or Steel for durable, lightweight crampons for hiking and nontechnical mountaineering. The Kahtoola Traction System (KTS) fits over all types of common footwear - running shoes, hiking boots, snowboarding boots, ski boots, and more. Straps and quick-release buckles on both the toe and collapsible heel pieces make the KTS easy to adjust. And when you"re not wearing them, the KTS folds into a compact package.