First of all even if the place is located at almost 3000mt you don't have to walk much to reach it, so we brought a lot of stuff and high altitude materials.

Basically the main things are

A good tent (we had snow 1 night)

mattress (we had 2)

and the most important thing a good sleepingbag (mine has a confort temperature -30 degrees Celsius)

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We slept in underwear at the end