Therm-a-Rest Parsec™ 0F/-18C Sleeping Bag

The Therm-a-Rest Parsec 0F/-18C is a winter mummy bag rated to -10°C comfort and -18°C limit under EN/ISO 23537, built for ski touring and winter backpacking at genuinely low temperatures. A 680 g fill of 800-fill Nikwax Hydrophobic Down is distributed 60/40 with more insulation over the top of the body where it matters most, and horizontal box-baffle construction prevents down migration. Total weight of 980 g reflects its extreme-cold category rather than any attempt at being lightweight. Both shell and liner are 20D recycled nylon ripstop, the hood is fitted and adjustable, and the bag has a draft collar plus a draft tube along the zipper. A stuff sack is included. The down is RDS certified and the fabric contains recycled content. The listed maximum user height is 167 cm, suggesting this sizing suits shorter frames or requires checking a longer variant. Suited for winter expeditions and ski mountaineering where thermal performance, not minimal weight, is the priority.