Water resistant polyurethane nubuck and nylon upper is flexible and cold resistant. Rubber outsole protects upper from scuffing. Comfortable EVA midsole. TPU shank insert provides increased arch support. Double stitched, sealed seams at wear points increase durability and help keep water from entering the boot. Removable triple density thermo liner has an internal lacing system, pre molded ankle support, and protective outsole. External lacing helps provide a secure fit and adds support and stability. Pull tabs are conveniently placed on back of both boot and liner for easy on and off. Reflective Tuning Fork patch. Exclusive Yamaha applique on front of boot. Comfort rated to -40F, -40C. For best fit, order one size larger than normal shoe size.