A good night’s sleep is the best way to get ready for an alpine start and a 12-pitch climb, which means Marmot’s Nanowave 25 25 Degree Synthetic Sleeping Bag is a key part of a successful send. It’s light and highly packable (there’s also a compression sack included), so schlepping it into the base of the climb is super easy, but the Spiralfil insulation will keep you warm even if temps drop down below freezing - not that mountain nights would ever do such a thing.