The Lamina Z Bonfire Sleeping Bag is Mountain Hardwear's warmest synthetic bag, built for winter camping trips in the alpine. Its unique Lamina construction welds the water resistant shell to Thermal. Q insulation for better protection against moisture. Zoned insulation places more warmth where you want it, and less where you don't need it. Every bag in the Lamina collection is lighter and more compressible than other down bags of the same temperature rating. Mountain Hardwear cut the Lamina Z Bonfire into a slightly wider mummy shape to better accommodate expedition clothing. Despite its wider fit, the Bonfire has a snug, tailored hood with a face gasket to protect your head from harsh winds. It has an ergonomic draft collar down the full length zipper, and the footbox is bigger for more comfort.