Patagonia’s River Crampons are the highest-traction wading devices ever built. The secret is the widely spaced aluminum-bar treads, which are hard enough to cut through algae and slime, yet soft enough to grip the rock itself. This season, we’ve made the River Crampons significantly lighter and more flexible by mounting the bars to a fully adjustable, recycled plastic frame, which is held in place with an easy-on, easy-off harness system. The Ultralight River Crampon fits over any wading boot and comes in two sizes: S/M for size 6 through 10 boots, and L/XL for 10 through 14. Simple, easily cleaned design and fast-drying materials help stop invasive species transport.