Madshus Hyper U Ski Boots Combi Boot for Sport and Junior Racing NNN Outsole Madshus boots use the Rottefella NNN binding interface With two guide rails and a broader binding plate, NNN offers maximum stability and control over the ski Lacing finger system provides snug, adjustable fit and excellent control Breathable Membrain Softshell lace cover and abrasion-resistant Cordura upper A tall, supportive cuff give stability for skating, while the flexible forefoot allows good classic technique