Sierra Designs Wild Bill 20 Degree Long Men's Three-Season Synthetic Blue Sleeping Bag Climashield HL fill is a synthetic continuous filament insulation that is moisture resistant and warm Pillow pocket holds a pillow in place in the hood Ergonomic Hood is warm and comfortable, and draft tube along zipper insulates against cold spots External Zipper Pocket holds small items Snag-Free Zipper Tracks, Pad Locks