VERSATILE TRACTION: Customized traction on the fly; easily change soles as conditions or terrain demand; WATERPROOF: 100% Waterproof breathable bootie construction combined with waterproof leather keeps feet bone dry; INSULATION: 1200g of 3M Thinsulate insulation, highly rated for extreme winter cold; DURABILITY: Molded TPU toe cap for durability and protection with recessed stitching for added abrasion resistance; FIT SYSTEM: Boa M4 Fit System for fast and effortless on/off and custom fit; TEMP RATING: Comfort rated down to -60 Degrees Fahrenheit; SPECS: 11" height / 4lbs 4oz per pair