Nemo Canon Down Sleeping Bag Down CENTER ZIPPER: The full length center zip of Canon can be partially opened for access without leaving the warmth of the bag DOWNTEK: A nanotechnology treatment that makes down water-repellant, and also provides anti-microbial and anti-bacterial protection. In the presence of moisture, DownTek treated down repels water while maintaining its loft and insulation value, even in the wettest of conditions. OSMO DT W/B SHELL FABRIC: 15 denier high tenacity nylon constructed with featherweight Japanese fibers. Double ripstop threads in the warp and weft give the highest level of tear strength and durability. An ultralight waterproof/breathable coating on the back side of the fabric combined with the highest quality DWR on the face means that the sleeping bag stays breathable and wont retain moisture throughout your adventures. TOESTER BOX: Hybrid Synthetic/Down construction reduces cold spots by mapping out areas of high compression and optimizing insulation loft.