This impressively light RC3 Classic boot features an improved tongue construction for added comfort and convenience, secure fit through Speed Lock lacing, and breathable Triple-F Membrane to keep moisture out. Weight: 435g Internal Molded Heel Cap: Internal anatomically shaped heel cap. Very light and individually thermoformable. Sport Fit Concept: The right fit for all requirements. Whether it's shaped for the female foot with the comfort or race version, customised for the feet of young skiers, meeting the comfort requirements of all-rounders or for direct power transfer in racing: the Boot Fit Concept with special lasts is the answer to all the different needs and morphologies of the various consumer groups. Comfort Guard: Very lightweight, water-repelling insulation material for additional thermal protection in the forefoot and toe area. Fischer Fresh: Fischer Fresh puts an end to unpleasant odours, giving you lasting freshness inside the cross country skiing boot with a pleasant s