Alpina Womens BC-1550 EVE Back-Country Nordic Cross-Country Ski Boots for NNN-BC bindings Womens anatomic footbed and last provide a comfortable all-day fit Plastic cuff and heel counter provide superior fit and control Thinsulate insulation  Retains warmth even when wet Speed lace system and velcro strap allow for a fine tuned fit providing comfort and ski control NNN-BC Sole provides excellent ski control and good walking traction when off skis. Compatible with Rottefela NNN-BC bindings