Nemo Sonic Down Sleeping Bag

The Sonic features Thermo Gill vents, which are specialized zippered openings that allow you to dump excess heat without unzipping the entire bag. This lets you fine-tune your internal temperature without losing all your trapped warmth.

Yes. The bag is designed with stretch construction at the knees, which provides extra room for side sleepers to shift positions without feeling restricted or compressing the insulation.

The Toester footbox is reinforced with waterproof material to protect against condensation that often builds up on the walls of your tent. This prevents your feet from getting damp if they happen to press against the tent fabric during the night.

Chevron baffles are designed to keep the 800-fill power down insulation evenly distributed throughout the bag. This structure prevents the down from shifting or clumping, which eliminates cold spots and ensures consistent warmth.

The Sonic is designed to accommodate users up to 78 inches (6 feet 6 inches) in height. If you are near this limit, you may want to ensure you have enough room to fully extend without compressing the footbox.

Yes, it uses hydrophobic down. This treatment helps the feathers resist moisture and maintain their loft even in damp conditions, which is crucial for a bag intended for extreme mountain environments.