What Our Gearhead(R) Experts Are Saying:"I like the Ascent 0F for regular mountain trips where nights are cold but comfort still matters. The wide mummy cut gives you room to move, and the sidewall baffles do a great job maintaining loft through the night. It's warm, durable, and easy to live with on multi-day trips."We reach for the Ascent 0F Sleeping Bag when shoulder seasons blur into winter and dependable warmth is a must. Built for trekking and backpacking in cold mountain environments, it balances serious insulation with a comfortable shape that helps us sleep better night after night. Designed with L. O. F. T(TM) baffle technology and sidewall construction, the Ascent maintains consistent down distribution and heat retention while remaining packable. The wide mummy profile, anatomically shaped footbox, and 3D neck collar improve comfort for side sleepers, while details like the arm access vent and smooth YKK(R) zips make long nights in the tent more manageable. Filled with hydrophobic 650FP European duck down and wrapped in a Pertex(R) Quantum shell, it delivers reliable warmth in cold, variable conditions.