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Free Shipping. Boreal Men's Asan Boot (Fall 2007) The Asan Boot by Boreal is designed for cold conditions, glaciers, snow couloirs, long approaches, and classic mountaineering.Specifications:3 - 13 u.k. in half-sizes. 1803 gr. pair. Size 7 u.k.Boreal PBG-650 with lateral reinforcements for superior control.Boreal Mount FDS-3 with triple density rubber.Plus 10 mm. EVA-Pro midsole for shock absorption and thermal insulation.Features:One piece premium quality waterproof and reinforced 2.8 mm. Nubuck leather.Fully padded for superior comfort and thermal isolation.Boreal Dry-Line for absolute waterproofness and superior breathability.Crampon compatible.