The Alpina T40 NNN is a great option for cross country enthusiasts who want an awesome skating boot. The footbed forms to your foot anatomically for a comfortable and good fit while the insulation will keep your toes warm on the coldest days. A tough and durable outer shell beefs up the T40 as well as keeping unwanted moisture out for drier feet and the added soles provide great traction on icy surfaces. Stay on trail with a boot that supports your adventures with the T 40 NNN from Alpina. Compatible with Turnamic, NNN, and Prolink Bindings, Alpina 2C Sole- Better traction on uncertain surfaces., Anatomic Footbed- Great fit with maximum comfort., Thinsulate Insulation- Adds warmth and extra comfort., Lace Cover- Keeps out any unwanted moisture., Warranty: One Year, XC Ski Best Use: Skate, Compatible Binding System: NNN, External Frame: Yes, Covered Laces: Yes, Insulation Material: Thinsulate, Ski Gear Intended Use: Cross Country, Support: On Trail Performance, Warmth: Warmer, Model Year: 2022, Product ID: 909623, Model Number: 53541K 41, GTIN: 3838421849895