| RefrigiWear Extreme Hiker | Waterproof | Lightweight | Black | Ragg Wool/Leather/Nylon | 10.5. RefrigiWear Boots | Comfort Rating: -40°F to 10°F RefrigiWear® Hybrid Traction outsole The BOA® Fit System for micro-adjustable fit that won't come loose Dial into fast, effortless, precision comfort and warmth with the Extreme Hiker Boots featuring the BOA® Fit System. When you're working in extreme cold conditions, you don't want to take your gloves off to adjust your boots. With the BOA® Fit System, you don't have to. Use the dial to tighten and loosen without compromising hand protection... - RefrigiWear Extreme Hiker | Waterproof | Lightweight | Black | Ragg Wool/Leather/Nylon | 10.5. |