Details Rab Altus Jacket Rab have a long and distinguished history in developing down insulation. Now they have teamed up with 3M to develop a synthetic insulation with high-loft, quick drying times and great compressibility, which they claim has similar insulating properties to 600 fill power goose down. The Altus Jacket uses a light-weight Pertex® Quantum™ shell treated with 80/20 DWR to add wind resistance and water resistance to the mix, resulting in a product that thrives in cold, damp conditions. Could it help you do the same? Weight: 438g (size L) Cirrus™ powered by 3M Featherless insulation (equivalent to 600 Fill Power goose down) Stitch through mini-baffles Full length front zip with insulated baffle and chin-guard 2 zipped hand warmer pockets (left pocket doubles as stuff sack 1 zipped internal pocket Lycra bound elasticated cuffs Slim fit Fabrics: Shell: Pertex Quantum Pro 20d, DWR 80/20 treated, 100% polyester. 40g/m2 Insulation: Cirrus™ powered by 3M Featherless insulation 195g Lining: Hyperlite 100% nylon 20d micro-ripstop 36g/m2 Specifications Altus Jacket - Men's