If you want to enter your first experience of cold winter conditions, confronting serious negative temperatures and on a reasonable budget, a "900g Pyrenean duck" will do the job.
Like with the Gray Goose, the "fatty" Pyrenean duck is a recognized and highly demanded quality on the world market, due to the maturity of the clusters, and with up to 90% pure clusters, the Pyrenean duck can compete against industrial goose down qualities, where the question about maturity of the animal is secondary. Only problem is to get your hands on this quality, but being a Pyrenean based company, we don't have this problem.
The shell fabric of the SWING 900 is based upon a very nice and solid acrylic on the outside and a polyester inside, both produced 100% by Asahi-KASEI in Osaka Japan.
So, when you are looking for your first down bag for 4 season use, a SWING 900 is your selected choice.
Comfort Rating: 19.4º F; Extreme: -13º F
Carry Weight: 44.9 oz. (sm), 48.3 oz. (md), 52.7 oz. (lg)
Size: 38.6" x 66.9" (sm), 40.6" x 72.8" (md), 42.5" x 78.7" (lg)
Carry Size: 12 L
Fill: Duck 700+
Fill Weight: 29.5 oz. (sm), 31.5 oz. (md), 34 oz. (lg)
Shell: Asahi Kasei coated and WR treated solid Polyamide Rip-Stop
Liner: Asahi Kasei anti-static, comfortable, WR treated Polyester Rip-Stop
Fits To: 5'6" (sm), 6' (md), 6'6" (lg)