>>302856Avalanche training.
General mountaineering safety training.
Avalanche gear (beacon, probe, shovel, avalung, ABS airbag pack).
A friend who also has avalanche training, mountaineering safety training, and avalanche gear.
Skis with AT (alpine touring) bindings.
Climbing skins for your skis.
Boots optimized for AT (with a lever on the back to make them less stiff, good for walking in).
Adjustable length poles (optional).
Knowledge of the area you are skiing so you don't get lost, fall through a snow bridge into a hidden crevasse, etc.
Depending on where you are hiking and skiing, potentially ice axes, crampons, rope, and other mountaineering equipment. This is important on some mountains even if the hike is fairly shallow because of the risk of crevasses hidden by snow bridges.
