Mythic Ultra series bags take advantage of both top notch down and a new Thermo Ionic Lining technology which reflects your body heat back at you. This technology is based on a super light layer of titanium incorporated in the fabric's fibers, offering extremely low weight and a great addition to warmth. Renewed model: while the fabrics are still 100% in the ultralight division, they're just a touch more durable than before. Also, the temperature ratings are nowadays EN standard tested. Due to having a very short zipper '(1/8' length) this bag is a bit more laborous to get into than your average bag. But this is, indeed, not your average bag! - Sporty Mummy Taper shape for best warmth to weight ratio - Regular size: bag length 215 cm, max. user length 185 cm, shoulder girth 160 cm, hip girth 134 cm, foot box girth 102 cm - Insulation: fill power 900+ down, made in Europe, R.D.S certified, amount 180 g - The down is treated with Hydrophobic Down, making for better performance in damp