Editing Mountaineering (section)

===Snow cave===
Where conditions permit, [[snow cave]]s are another way to shelter high on the mountain. Some climbers do not use tents at high altitudes unless the snow conditions do not allow for snow caving, since snow caves are silent and much warmer than tents. They can be built relatively easily, given sufficient time, using a snow shovel. The temperature of a correctly made snow cave will hover around freezing, which relative to outside temperatures can be very warm. They can be dug anywhere where there is at least four feet of snow. The addition of a good quality bivouac bag and closed cell foam sleeping mat will also increase the warmth of the snow cave. Another shelter that works well is a [[quinzee]], which is excavated from a pile of snow that has been work hardened or sintered (typically by stomping). [[Igloo]]s are used by some climbers, but are deceptively difficult to build and require specific snow conditions.<ref name="freedom" />