Made for mountaineers looking for a lightweight and compressible jacket providing protection from extreme cold The warmest jacket in the Simond range, will protect you in extreme cold, (up to -29 DegC), at only 610 g (in size L) Warmth: Recommended temperature use = - 29 DegC. Stuff sack volume = 4L (L). Abrasion Resistance: Durable component on high wear forearm areas. Freedom of Movement: Close-fitting cut with armholes suitable for mountaineering. Warranty: 2 Years Manufacturer Warranty. Thermal Insulation: Duck down 90% down and 10% feather with a fill power of 700 Cuin (EU standard). Jacket's assembly is 3D partitioned. Our feathers come from Chinese ducks farmed for their meat. We retrieve their feathers after they are culled. We keep the ducks death certificates. Temperature Rating Use: Our jackets are lab tested in environmental chambers to identify the recommended temperature rating use. For moderate activity (in 5 km/h wind), this jacket is suitable for temperatures up to -29 DegC. Pockets and Sack: This jacket contains: 2 outer hand pockets 2 outer chest pockets accessible when wearing a harness + 1 patch pocket inside, one of these is for slipping in your phone 2 mesh net pocket inside jacket to keep your 2nd pair of gloves or flask warm 1 stuff sack for storing jacket on mountain excursions. Hood: Down hood designed for wearing over your mountaineering helmet, adjustable with 2 systems at front and rear of jacket. Reinforced at forearms: Durable component has been selected to reinforce jacket's forearms. As a matter of fact, these are high wear areas. The component selected is more robust than the jacket's main component. Composition: Filling - 90.0% Grey duck down, Filling - 10.0% Grey duck feather Main fabric - 100.0% Polyamide (PA).