Korker's Men's Polar Vortex 1200g Insulated Waterproof Winter Boots - The legendary Polar Vortex series: choose your warm. OmniTrax Interchangeable Sole System for cusomized traction on the fly Easily change soles as conditions or terrains demand 100% waterproof breathable bootie construction combined with waterproof leather keeps feet bone dry 1200g of 3M Thinsulate insulation combined with Thermal Stack Technology Molded TPU toe cap for durability and protection Recessed stitching for added abrasion resistance Boa M4 Fit System for fast and effortless on/off Premium aerogel frost barrier footbed Comfort rated down to -60 degrees Fahrenheit 11in height 1927g weight per pair Snowtrac Sole Style: OB9901