Built with recycled PrimaLoft Silver Insulation Luxe and a recycled Pertex Quantum outer, the RAB Cirrus Hut Boots are lightweight, cosy and better for the planet. More Information After a day in climbing shoes, mountaineering boots, or ski boots, the Cirrus Hut Boots offer a soft, warm cocoon to worn out feet. Keeping you toasty to the tips of your toes, they extend up around the ankle and are perfect for use in mountain huts, draughty bothies, or just for relaxing at home on winter’s night by the fire. The Cirrus Hut Boots are filled with PrimaLoft Silver Insulation Luxe, a synthetic insulation made from 100% post-consumer recycled plastic bottle chips. They have a recycled nylon lining and a breathable and weather resistant recycled Pertex Quantum outer. The lower edge of the boot is reinforced with tough nylon with a cushioned EVA foam footbed and a flexible, non-slip sole. Features Above-ankle cuff with drawcord cinch to trap in the warmth Loose fill synthetic insulation is warm, packable and easy to maintain Tough 600D nylon edge for abrasion resistance Non-slip PU outsole with EVA padded sole unit for comfort Rear pull-on loop Specifications Weight 206g/7.3oz (Size M) Outer Fabric Recycled 30D Pertex Quantum with fluorocarbon-free DWR (50gsm) Lining Recycled, soft 20D fabric PrimaLoft Silver Insulation Luxe A 100% recycled synthetic insulation with a luxuriously silky texture that mimics the performance of down. Providing warmth without bulk and highly compressible, it's ideal for mountain activities even in damp conditions. Pertex Quantum A soft, lightweight, windproof fabric that encourages insulation to fully loft. Highly packable and protective, it's ideal for mountain activities.