NEMO Equipment Soul Synthetic Mummy Sleeping Bag

The NEMO Soul is an ultralight mummy bag with synthetic insulation rather than down, weighing 964 g total. The fill is Zerofiber 800, a 100% recycled synthetic insulation, and the bag uses mono-polymer construction throughout so it can be fully recycled at the end of its life rather than mixing materials that are hard to separate — synthetic fill also means it keeps insulating reasonably well if it gets damp, unlike down. The Headwall draft collar seals in warmth around the neck and shoulders, while the Thermo Gill foot-box vent lets you dump excess heat from the feet without unzipping the whole bag — useful on a warmer night when a full mummy bag would otherwise run hot. As a unisex, ultralight design, it suits backpackers and thru-hikers who want synthetic fill's damp-weather reliability without taking on the weight penalty older synthetic bags carried, though anyone chasing the lowest possible weight for dry, cold conditions would still get a better warmth-to-weight ratio from down.