Control your climate with the Arapaho's innovative J-zipper, allowing you to unzip for ventilation and keeps the cold out with a thick baffle running the length of the zipper. In order to maximize warmth with minimal weight, the Arapaho utilizes a 60/40 insulation split from top to bottom. Combining the generous neck baffle with the form-fitting hood, you will easily snug yourself into a cozy cocoon. To ensure that this bag will last for many years, it comes with both a stuff sack and a mesh storage sack that allows the bag to dry and maintain loft properly while in storage. EN rated for a lower limit of 23F, the Arapaho will give you the needed comfort to maintain your temperature throughout Spring, Summer, and Fall.