Features of the Mountain Hardwear Lamina Z 22 Sleeping Bag Proprietary, welded Lamina construction enhances loft and eliminates cold spots Zoned Insulation maximizes warmth where it's needed most Thermal. Q Insulation has outstanding compressibility and maintains excellent loft Comfort mummy cut efficiently maximizes weight without constriction Ergonomic draft collar blocks the escape of heated air from inside the bag Full length 5 zipper with double slider s for versatile ventilation Comfort foot box follows natural foot position for maximum warmth and comfort Face gasket and tailored hood comfortably block drafts at the hood opening and seal in warmth Durable, lightweight nylon shell with DWR treatment repels water Soft polyester lining wicks away moisture Zippered pocket at shoulder for storage Thermal.Q Elite replicates the structure of down for the Highest warmth-to-weight ratio available in synthetic Insulation