Nemo Sonic -20F/-29C Down Sleeping Bag

Picture yourself waking up at a windswept alpine camp with frost on the tent walls, warm and rested instead of shivering through the night. The Nemo Sonic -20F/-29C Down Sleeping Bag is built for exactly that moment, giving you the confidence to push into big-mountain terrain and brutal winter conditions without packing multiple bags for different seasons. Thermo Gill vents paired with a multistage zipper let you dump heat or seal it in from right inside the bag, so you can fine-tune comfort as the night warms up or cools down instead of unzipping and shivering while you fuss with layers. Chevron baffle construction keeps the 800 fill power down evenly lofted and locked in place, which means consistent warmth instead of cold spots from shifted insulation. The redesigned draft collar, bolstered draft tubes, and proven Toester footbox round out a sleep system that keeps your feet warm, guards your down from tent condensation, and even helps dry out damp clothes overnight. Whether you are guiding an ice climb, waiting out a storm above treeline, or just want one bag that handles everything from deep winter to shoulder-season trips, the Sonic is built to be the last cold-weather bag you need to buy.

Features

• Thermo Gill vents with a multistage zipper system let you fine-tune warmth from inside the bag as conditions change
• Chevron baffle construction compartmentalizes down to prevent migration and keep insulation evenly lofted
• Redesigned draft collar and bolstered draft tubes seal in heat around the neck and zipper line
• Toester footbox keeps feet warmer, blocks tent wall condensation, and protects down from moisture while doubling as a spot to dry damp clothes overnight
• Hydrophobic down resists moisture for reliable loft and warmth in damp winter conditions
• Shell and liner fabrics are 100% recycled and bluesign approved for reduced environmental impact
• Down is 100% Responsible Down Standard (RDS) certified
• Includes a compression sack for packing down small and a drawstring mesh storage bag for home care