Sonic -20

The Sonic -20, by Nemo, is the sleeping bag designed to be the only one you'll ever need between -29°C and 4°C. 

This high-mountain sleeping bag, awarded Backpacker's Editors' Choice, delivers exceptional warmth and versatility while reducing its environmental impact. 

It features next-generation Thermo Gill™ vents, with a new multi-position zipper system that significantly expands the usable temperature range and allows precise comfort adjustment from the inside. 

The Sonic's chevron baffle construction better compartmentalizes the down, preventing migration and ensuring consistent loft. (Not to mention its exceptional look!)

The shell and lining fabrics are made from 100% recycled fibers and are bluesign® certified, while the premium 800 FP hydrophobic down is RDS (Responsible Down Standard) certified . 

Years of field experience have led to significant improvements to this sleeping bag, including an optimized profile, a redesigned draft collar, and reinforced draft tubes. 

The proven Toester™ footbox keeps feet warm, provides a waterproof barrier against condensation on tent walls, and protects the down from moisture while drying damp clothing inside.

Adaptable to all mountain weather conditions, the Sonic sleeping bag remains the benchmark for extreme conditions.

• Award-winning design updated for improved heat retention and increased adaptability to varying temperatures.
• Made with 100% recycled, bluesign®-certified outer and inner fabrics.
• Second-generation Thermo Gill™ vents extend the comfort range with a new multi-level zipper system.
• Filled with premium 800 FP hydrophobic, PFAS-free, RDS-certified down. Products certified to the Responsible Down Standard (RDS) contain down or feathers sourced from farms certified for animal welfare.
• Chevron construction better compartmentalizes the down for more uniform loft and prevention of down migration .
• Stretch construction at the knees for optimal comfort in a side-sleeping position.
• The Toester™ waterproof and breathable footbox uses a synthetic insulation layer to protect the down and deliver maximum warmth to the toes.
• The offset zipper creates an effective thermal seal while a redesigned profile keeps warmth closer to the body.
• Backed by the Nemo Adventure Forever™ guarantee.