Get ready to face the most extreme conditions at high altitudes with the Rab men's mountaineering booties. Designed for polar or mountain expeditions, these weather-resistant down booties offer unmatched comfort at base camp and bivouac. Filled with 800 fill power goose down and featuring a weather-resistant Pertex® Quantum Pro outer fabric, these booties ensure optimal thermal insulation. Their double lining adds an extra layer of warmth to keep your feet warm even in freezing weather. The modular system offers unparalleled versatility. The removable outer sole, equipped with a Velcro closure, allows for practical use around the base camp. Once inside the tent or sleeping bag, you can easily remove it to avoid bringing in dirt or snow. The 12 mm closed-cell foam midsole effectively insulates your foot from the ground and maintains its shape even after intensive use. Finally, the one-hand adjustable elastic cord allows you to close the booties in an instant, preventing snow from getting in. Insulation: 800 fill power European goose down with Nikwax fluorocarbon-free hydrophobic finish (128g/5oz, Size L) Materials: Inner fabric - Nylon, DWR 80/20,1cc,49g/m²,30d/30d,100% nylon, Outer fabric: Pertex® Quantum Pro, 1000 HH, DWR 80/20,52g/m²,30d/30d, 100% nylon 6 with Pertex® Pro coating Outer fabric in Pertex® Quantum Pro 800FP European goose down with Nikwax fluorocarbon-free hydrophobic finish (128g/5oz, Size L) Rab® fluorocarbon-free hydrophobic down developed with Nikwax® Modular system, use with outer sole around camp, use without outer sole in the tent Double lining boot construction Removable outer sole with hook and loop fastening 12 mm closed-cell foam midsole One-hand drawcord closure Storage bag Weight: 640g Rab Expedition Boots - Mountaineering boots - Men's | Hardloop