All mountain ski boots kids ski boots freeride ski boots suitable for kids season 2016 skill level advanced last 100 mm width average flex index 80 flex medium special features ski walk mechanism anti slip sole removable toe and heel pads walk to ride wtr compatible outer materials polyurethane polyolefin colour yellow fasteners buckle fastener velcro buckle 4 x micro adjustable aluminium buckles strap 40mm velcro strap shoe technology sensor gr