Waterproof and reinforced one piece Dynatec with Lorica. Bi-Flex system for superior flexion and comfort. Three-piece adjustable hook and loop Tongue System (VTS). Neoprene closure for thermal insulation. HFS padded heel system for a perfect fit. Boreal Dry-Line® for absolute waterproofness and superior breathability. Full internal triple Thinsulate® layers for thermal protection. Boreal PBG-680 with lateral reinforcements for torsion control. Unique triple layer Thinsulate® thermal protection. Vibram Teton. Rubber sole with dual density, shock absorbing EVA and PU. TPU heel and toe piece for automatic crampons. Very cold conditions. Alpine climbing. Technical ice and mixed climbing. "