Part of our new ultralight composite bag series​,​ the Ion’s body-mapped combo of synthetic insulation and 850-fill-power water-resistant down fuses warmth with function. Rated down to 20 degrees and designed with a curved baffle construction to reduce shifting down​,​ this bag has loads of features designed to make your night comfy and cozy. Stuff and storage sack included. FEATURES: Body Mapped- 850FP Down wraps around body​,​ head​,​ foot and super efficient Thermal R Micro on bottom Fold-Down Second Zipper Provides added Ventilation​,​ Easy Access. Anti-Snag Slider reduces Snagging Anatomically Designed Footbox with Wrap-Around Construction increases Warmth EN Tested Full Length Locking YKK Two Way Zipper with Zip-Guard Slider Smooth-Curved Baffle Construction Reduces Down Shifting Nautilus Multi-Baffle Hood Down Defender to Improve Water-Resistance in Wet Conditions Insulated Draft Tube Hood Draw Cord Zipper Garage Stretch Tricot Baffles Two Hang Loops Insulation Material: 850+ Fill Power Goose Down SPECS: Fill Weight: 13.8 oz Bag Loft: 4.75 Bag Temperature:20° F Interior Length: 80 in Bag Dimensions: 60 in x 58 in x 41 in Weight: 1 lbs 12.5 oz SBID: SBJPR5XK