The Rab Cirrus Hut Boot gives our tired feet sweet relief after a day of skiing, mountaineering, climbing, or when we are sitting by the fire on a cold winter night. The boot cocoons our feet from toes to ankles in lightweight and packable 100% recycled synthetic insulation that looks and feels like down, but resists water and retains its shape. Material: 600D nylon Insulation: PrimaLoft Silver Closure: slip-on Sole: PU Claimed Weight: 7.3oz