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While some hiking shoes have a sloppy fit, the Mammut Ducan BOAT Low GTX Hiking Shoe snugs down tight for a performance fit. It's anatomically shaped for a sock-like fit that we can literally dial in with a BOA Fit System adapted from the ski boot industry. On the trail, the Ducan is fully waterproof and utilizes a spring-steel midsole to absorb shock and roll our foot into its next step for energy-efficient hiking.