The RAB Mythic Ultra 180 Sleeping Bag is an ultralight premium down bag engineered for fast-and-light backpacking, mountaineering and camping where every gram counts. Its 900+ fill-power R.D.S. certified European goose down with hydrophobic treatment delivers superior insulation and moisture resistance without weight penalty. The innovative Thermo Ionic Lining Technology (TILT) uses a heat-reflective inner coating to bounce radiant warmth back to your body for enhanced thermal efficiency. Built with super-light ripstop nylon outer and inner fabrics, it compresses to a tiny pack size ideal for minimalist pursuits. A contoured mummy shape with ergonomic hood and angled foot box maximizes warmth and comfort in chilly conditions. Weight-saving baffle design prevents down migration and cold spots for consistent loft. The short, anti-snag YKK® zipper and integrated draft collar further seal in heat. Perfect for cool to cold weather adventures, it balances exceptional warmth-to-weight performance with technical, expedition-ready design.