As is usual for L.I.M series products, the Airak delivers superb performance at an incredible weight. The surface fabric is moisture repellent Pertex Quantum Pro, and the liner is breathable and soft Pertex Quantum. - Alpine fit for reduced volume to warm up - Filled with 200 grams of moisture repelling, RDS certified down - Half-length zipper saves weight - Waterproof stuffsack - Drying hang loops both on the inside and outside - Anatomic footbox keeps your feet from squishing the insulation - Footbox area with Mimic Silver 60g/m² extra insulation The size number tells the user's max. length. It's wise to store the bag in the included, large and airy storage bag. This enables getting the most out of the bag's service life.