For off-track touring, these boots have a natural, medium flex for travel in uneven terrain and through heavier snow. Synthetic leather and Thinsulate insulation add warmth and protection from the elements. Synthetic leather uppers. Thinsulate insulation adds deep-winter warmth. Hooks at the top of the laces keep them snug. Anatomic footbeds and medium flex ensure a natural stride when walking or skiing. Toe box protection and rubber rands. Soles are NNN BC compatible.