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The Montbell Super Spiral Down expedition weight down sleeping bag features 800 Fill Power high quality goose down, rated to -20 degrees, features a water repellent shell, and the supreme comfort of the Super Spiral-Stretch System.

MontBell has adapted a classic tailor's trick by integrating a woven fabric "cut on the bias". By orienting the fabric's warp and weft threads at 45 degrees to most major seam lines the sleeping bag becomes more fluid or elastic in nature.

Additionally, coiled or crimped fibers are used in the fabric weave to capitalize on their inherent stretch properties. To create an even more comfortable system we utilize an elastic stitch technique to create small "gathers" in the quilting.

By combining this stretchy fabric, strategic seam orientation, and the elasticized gathers these bags offer unrivaled fit and comfort. These innovations allow the sleeping bag to stretch with you as you change positions throughout the night, drawing the insulation closer to your body and eliminating drafty dead spaces. Keep body heat inside your sleeping bag, where it belongs.

Features:
Super Spiral Stretch System
Multi-Tube Construction with Flow Gate technology
Heat saving Tunnel Hood
Draw cord for face hole adjustment
Neck Baffle
67 in mating right & left hand zippers
Auto Locking Zipper to limit zipper "slip" during the night
Tapered, bias stretch stuff sack for easier packing
Cotton storage sack included
Double draft tube for increased zipper draft protection

Specs:
Temp Rating: -20 F
Fill: 800 Fill Power Goose Down
Shell: 12-denier Ballistic Airlight Elite water-repellent performance
Size: Reg, Long
Color: PRSI(Persimmon)
Weight: Reg 3 lbs 7 oz, Long 3 lbs 12 oz
Max User Height: Reg 6 ft, Long 6 ft 6 in
Inside Shoulder Girth: Reg 53"~75", Long 57"~81"
Inside Knee Girth: Reg 44"~62", Long 47"~67"
Stuffed Size: Reg 8.7" x 17.1", Long 8.7" x 17.1"