Marmot Trestles 15° Sleeping Bag

The Marmot Trestles 15° is a synthetic mummy bag built with SpiraFil insulation for the colder end of three-season use. Its EN-tested comfort rating of -3°C and limit of -9°C make it one of the warmer options in the Trestles range, which shows in its 1,535 g weight — synthetic fill can't match down's warmth-to-weight ratio, but it keeps insulating when damp, which matters on trips through rain or persistent condensation. The bag uses a full-length two-way zipper on the left side, letting you vent from the footbox or zip two same-side bags together. Shingled baffles keep the fill positioned and reduce cold spots along the seams, while a DWR-treated 70D polyester shell shrugs off light moisture and an insulated draft tube along the zipper cuts heat loss. At 158 cm shoulder width and rated for users up to 182 cm, this is a regular-size unisex bag that includes an internal pocket and stuff sack. It suits multi-day autumn and spring trips where reliability in damp conditions outweighs shaving grams.