The Zirkel will amaze you at how such a light weight bag can be so comfortable. Big Agnes takes a unique approach: their sleeping bags have no insulation on the bottom; instead they rely on Big Agnes' sleeping pads (sold separately) to provide the required insulation beneath your body. The result is healthy weight savings.A sleeping bag with the name Zirkel has a lot to live up to. It demands superior quality and cutting edge performance. The Zirkel will set the stage for future bags. Sound a bit bold for a small company located in the mountains of Colorado? Maybe. The Zirkel stands alone as the ultimate three-season sleeping bag. Its shell is made of Pertex Microlight fabric and filled with high-grade 725 fill goose down. It weighs just over 2 pounds and is rated to 20 degrees. From big walls to bagging peaks, the Zirkel will amaze you at how such a light weight bag can be so comfortable. Trust us.

Works best with Big Agnes' mummy pads. Fits up to 5' 10", inseam 32", chest 40". Bag weight = 2 lb 6 oz. Blue/Gray.

We recommend getting a Big Agnes Girdle with your new sleeping bag so you can compress it down nice and small when you pack up your gear for the trail.

Features:
Insulation - 725 fill goose down - one of the highest quality down fills available. 725 fill provides greater loft and insulating than the same bag would with 650 fill goose down.
Exterior Shell - Pertex Microlight is a tightly woven, 30D nylon microfiber rip stop fabric that is water resistant, and wind proof by construction and super breathable. The highest quality fluorocarbon DWR is applied to the fabric which makes it one of the most water resistant non-laminated fabrics available.
Interior lining - Pertex Microlight.
Exterior of pad sleeve - Durable 210T nylon rip stop. WR surface treatment for water repellency.
No-draft wedge - Continuous oversized draft wedge that insulates the connection between the bag and pad to prevent cold air from entering.
No-draft zipper tube - 3" diameter tube behind the full length of the zipper to prevent cold air from leaking in.
No-draft yoke - Shaped collar that extends down from the top of the bag sealing around the neck to prevent warm air from escaping and cold air from sneaking in.
Perma pillow - Built in pillow sleeve. Stuff in a jacket or a backcountry pillow and it will stay in place all night.
60" YKK zipper - #8 coil on all Divide Series bags
No-snag zipper action is prevented by running a fabric stiffener on both sides of the zipper that keeps the soft fabric from getting caught up in the zipper teeth.
Zip-together - Divide Series bags will zip together with other Divide Series bags, ie: Gilpin and Zirkel. You need a left and right zip combo to zip the bags together.