ATOP lacing system makes it so easy to perfectly tighten or loosen your lace pressure; Turn clockwise click-by-click to tighten and the reverse way to loosen; orrect lace pressure; 200gm of Thinsulate for added warmth; Bellows tongue to keep snow out; Padded snow cuff; Quick dry velour lining; 4mm insole; Breathable weather resistant upper material; NNN BC sole required by any Rottefella BC binding