The NEMO Forte Endless Promise 20 is a synthetic sleeping bag in a spoon-shaped cut, giving side and back sleepers extra room at the knees and calves compared with a classic mummy. A comfort rating of -2°C and limit of -8°C, tested to ISO 23537, place it in 3-season territory for cooler autumn and spring nights.
The 900 g Zerofiber 800 fill is synthetic insulation made from 100% recycled material; at a total bag weight of 1500 g this means a higher weight-per-degree figure than a comparable down bag, but synthetic fill keeps insulating even when damp — useful on wetter trips or with tent condensation. The 20D recycled polyester shell carries a DWR finish, and an adjustable hood, draft collar, and draft tube round out the cold-weather features, with a stuff sack and storage sack included.
Bluesign-certified and PFC-free, the bag is designed to be fully recyclable as part of NEMO's Endless Promise line — a solid choice for hikers up to 183 cm tall who prioritize synthetic reliability over the lower weight of down.