VERSATILE: OmniTrax Interchangeable Sole System for traction on the fly; easily change soles as conditions or terrains demand. WATERPROOF: Waterproof breathable bootie construction combined with waterproof leather keeps feet bone dry. INSULATION: 200g of 3M Thinsulate insulation with a plush lining for ultimate warmth and comfort. Comfort rated down to -20 Degrees Fahrenheit. ON/OFF: Metal speed lacing system for quick and easy lace-up. COMFORT: Shock-absorbing EVA midsole offers underfoot comfort and support.