Thermarest Parsec 0F/-18C

The Therm-a-Rest Parsec 0F/-18C is a down-filled sleeping bag designed for year-round use. The comfort rating is -10° Celsius, and it weighs just 1,100 grams in size M.

The fill is made of hydrophobic 900 cuin RDS-certified duck down. It contains 762 grams of fill in size M and 857 grams in size L. It compresses exceptionally well, taking up minimal space in your backpack. An extra compartment at the foot end is great for quickly warming your feet and preventing you from catching a chill on the coldest nights.

It features differential filling: the insulation layer is denser on top than on the back, which reduces the overall weight and concentrates warmth in strategic areas. On your back, your sleeping pad acts as insulation—which makes sense, since your weight compresses the filling while you sleep, thereby limiting its thermal benefit. The down-lined Toe-asis foot warmer allows your feet to warm up quickly.

• Zone-specific insulation: maximizes warmth and minimizes weight.


• At the feet, the compartmentalized construction provides good insulation and keeps your feet warm.


• Enveloping hood and collar to prevent heat loss.


• Protective flap over the two-way zipper.


• Zippered exterior pocket for small accessories.