The Rab Cirrus Hut Boot is a synthetically insulatedhut bootie that is perfect for keeping your feet warm in alpine huts or when your camping. The boots are insulated with Primaloft Silver Luxe synthetic insulation made from 100% post consumer recycled materials. This is designed to behave like down, yet unlike down, it is easy to wash and will still retain heat even when it is wet. A recycled 30D Pertex Quantum ripstop outer that benefits from a DWR treatment makes the boots water and abrasion resistant, protecting the insulation inside. The sole unit is EVA for comfort whilst the outside is nylon and non-slip PU which prevents you from sliding around on those wooden hut floors. Please be aware that these are designed as lightweight hut slippers for occasional use. They are not robust enough for everyday household use. Rab Cirrus Hut Boot Features 100% Recycled Primaloft Silve Luxe insulation 30D Recycled Pertex Quantum Ripstop outer EVA sole unit Tough nylon and non-slip PU sole Sizing SizeUKEU Small5 - 637 - 39 Medium7 - 840 - 42 Large9 - 1043 - 45 XL10+46+ Weight:206g (size M) Rab Cirrus Hut Boot