Marker Junior Ski Binding Gliding AFD Compact Heel Compatible with GripWalk and Standard Alpine Boot Soles The Marker Free 7 makes a great binding for heavier or stronger skiing junior skiers. The Compact Heel is very lightweight and easy for younger skiers to step into. Marker's Patented Gliding AFD provides consistent release even with worn down or dirty boot soles that many junior skiers have. The Free 7 is fully compatible with GripWalk or Standard Alpine Boot Soles. Marker Free 7 Junior Ski Bindings