The Nemo Kayu 15 Degree is filled with Premium 800 FP down, hydrophobic, PFC-free, and 100% Responsible Down Standard (RDS) certified for traceability and humane treatment throughout the supply chain. Other features include Thermo Gills for draft-free temperature regulation, and a waterproof/breathable footbox and hood to protect you head to toe from tent wall condensation. Opposite-sided, full-length YKK no-snag zippers allow men&';s (left side zip) and women&';s (right side zip) models to be zipped together to create a double sleeping bag. A fabric set of 20D Nylon Ripstop DWR on the shell, an ultra-plush 30D Nylon Taffeta lining, and a 40D Nylon Ripstop OSMO DWR footbox offer a supreme sleep experience for the most serious ultralight adventures. Sculpted fit with trim, tailored mummy patterning is designed for optimal thermal efficiency and packability. Premium 800 FP down is ultra-packable, hydrophobic, PFC-free, and 100% Responsible Down Standard (RDS) Certified for trace