It moves forward but not backwards, and is a great safety development on the mountain.
Climbing apparatus: Harness, ice axe, jumar - a clip device that you attach to your harness and the fixed rope. It moves forward but not backwards, and is a great safety development on the mountain. Also essential are a head lamp, karabiners, Alpine climbing harness, rappel device, ski poles, altimeter and crampons. And you'll require a set of 'pigs' nipples' (rubber covers for the spikes so they don't tear your tent apart) as well as goggles for snow conditions.