The Nemo Sonic is engineered to be your go-to sleeping bag for temperatures between -29°C (-20°F) and 4°C (40°F.) This high-altitude sleeping bag, which has earned the Backpacker EditorsChoice award, delivers outstanding warmth and versatility while minimizing environmental impact. It incorporates Nemo's advanced Thermo Gill vents with a new multi-stage zipper system, greatly extending the bag's temperature range and allowing for precise comfort adjustments from the inside. The Sonics chevron baffle design ensures the down stays evenly distributed, preventing clumping and maintaining loft, all while boasting a sleek appearance. Both the shell and liner fabrics are made from 100% recycled materials and are bluesign approved, and the high-quality 800 FP hydrophobic down is fully Responsible Down Standard (RDS) certified. Drawing from years of field testing, this bag includes refined features such as an optimized profile, an improved draft collar, and enhanced draft tubes. The reliable