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One of the warmest plastic mountaineering boots made, the Koflach Arctis Expe Boots are compatible with Randonee ski bindings and nearly every kind of crampon and snowshoe. Rated to 50degF. Recommended for serious expeditions, technical ice climbing, and general mountaineering. . Dual density polyurethane Y technology soft plastic uppers retain their supple flex even in sub zero temperatures, while the lowers utilizes a stiffer plastic to ensure a steady platform. Shell features a rigid shank, a slight rocker for walking comfort, and has prominent step in grooves for binding compatibility. A layer of synthetic cork is used in the shell's sole for additional insulation and shock absorbency EVA heel plug further helps to dissipate shock. Special Vibram winter climbing configuration for improved performance in snow. Recessed heel pocket in bottom of shell interlocks with the inner boot's heel to prevent any play between the two components. Fully lace removable inner boot made from both open and closed cell foam to maximize insulation while blocking out moisture accommodates all foot volumes and shapes. Inner boot features thermo formable heel and ankle padding adapted from Atomic's alpine ski boots to allow for a better performance fit, reduced heel lift, and increased comfort. Inner boot can be worn inside a sleeping bag in expedition conditions men's sizing: consult chart to translate for women. Note: These boots are UK sized and shipped according to their UK size. Please use the size chart to find your appropriate UK size.
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