BACKCOUNTRY SKI BOOTS - The Whitewoods 306 NNN-BC Ski Boots with breathable weatherproof upper, 100 grams Thinsulate lining & quick dry liner for warmth are designed to provide comfort, style and technical value COMPOSITE MID SOLE - Whitewoods's improved composite mid sole and steel shank provide anatomic support, moisture management and improved ski control METAL LACE GUIDES - These bc ski boots are lightweight, durable, and have reinforced heel counter for added stability and improved metal lace guides for ergonomic lace pressure to help you customize the fit COMPATIBLE WITH NNN-BC BINDINGS - These unisex adventure ski boots with Gaitor D ring, Gusseted tongue & pull-on loop will work with NNN-BC Bindings only COMFORT & SOFTNESS - These nordic ski boots feature soft and flexible padded ankle for comfort and keeping the snow out; improved anatomical foot-bed