La Sportiva - K4 S (Yellow) - Men's: Built for winter mountaineering, alpine rock and ice, technical mixed routes and waterfall ice climbing. Dial in the perfect custom fit with our patent pending EZ Flex removable hook-and-loop fastener adjustable tongue and EZ System lace hardware. Vibram Clusaz sole provides a crampon compatible sole with super aggressive heel brake and lug pattern for better plunge stepping. Synthetic Benecke CeraCom upper with Thinsulate insulation makes this the warmest, most advanced single mountain boot made.
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