Ski technique changes over time to become more efficient, more powerful, more competitive. Same for equipment. Skiathlon , aka Combi boots, were considered very specialized for Skiathlon competitions or for lower cost and performance entry level gear. But as cross country classic racecourses have become more demanding many of the world elite are donning Skiathlon boots for a pure classic race. Gone is the clunky and movement inhibiting cuff designs, now a skier can have superior downhill control without sacrificing striding fluidity. Turnamic sole fits Turnamic, NNN, and Prolink bindings Carbon fused polymer cuff has great lateral stability with excellent forward range of motion Smooth and soft classic sole flex Carbon heel is close fitting and solidly anchors the cuff Fischer Nordic Boot Size Chart