From the Montbell Website:
U.L. Super Stretch Down Hugger #0 #2321657
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NOTE : Actual color may vary.
*Comfortable Temperature: 3.2F
[Inside Shoulder Girth] 53.2"- 70.9"
[Inside Knee Girth] 42.8"-57.1"
Total Weight: 2lbs.10oz
Fill Weight: 1lb.9oz
Insulation: 725 fill power goose down
Max User Height: 5ft, 10in
Construction: Multi Box Construction
Stuffed Size: 7.3" x 14.4"
Features: Double Draft Tube, Neck Baffle, Neck Adjuster, Tunnel Hood, Bottom Adjuster
• Standard DWR Treatment
SURD (Sunrise Red)
From the MOntbell Website:
U.L. Super Stretch™ Down Hugger™
We use high quality goose down, patented construction techniques, and ultralight materials, to reduce weight while maximizinge efficiency and compressibility.
Thoughts...I recently purchased this bag to finalize my "ultralight" winter gear. My wife had an older Montbell bag, and I've bee consistently warm AND comfortable in that bag multiple times.
The reason I chose the Montbell bag over the Marmots, Western Mountaineering, etc. bags is due to a couple of reasons. 1. The "superstretch" system, for me, is ideal. I'm 5'9" tall with a slim to medium build. I find a lot of times most seeping bags that I will use will have a lot of empty space my body has to heat, instead of heating me. Also, this bag comes in a 5'10" size (the regular), so my 5' 9" frame fits perfectly, as opposed to other manufacturer's who use a 6' "regular" bag, where I end up with all this extra room around your feet. This also means the bag is lighter than most others too.
The other main reasons are the features this bag offers, while still only weighing in at 2lb 10oz. Full Zipper, the ability to fold the bottom of the bag inward witha drawstring, full neck baffle, and a zipper baffle guarentee warmth. All these features are normally limited on ultralight bags.
The reason for this is the ability to use less fill (725 vs. 800 or 900) because of the superstretch system. In essence, the elastics create small pockets of air that keep your body warm, instead of just heating the entire length of your body. This creates a warmer bag with less fill.
If you haven't tried a Montbell bag, I encourage you to try one. I have been very pleased with their products. Keep in mind your height, however, if you are over 5'10" tall, you will need their "long" bag.