The Mythic 180 has won a Gold Award at OutDoor. The TILT lining reflects the UV and infrared rays back out at you, adding 30% more efficiency (around 8 degrees Celsius). It feels the same, breathes the same, and weighs the same. The 180 version has a small zip to save weight, but still allow you to get into the bag. 400g / 0 degrees comfort limit.