If you&';ve ever wished for a less-constrictive sleeping bag that keeps you comfortable in a variety of cool-to-warm conditions, the Trek may become your go-to bag. The Free-Flow Zip system allows you to open the bag sequentially for ventilation up to the point where it is opened flat as a quilt - you can even secure the snaps around your shoulders, open the footbox zipper and &';wear&'; the Trek around camp. 650+ fillpower duck down with a non-PFC Ultra-Dry Down treatment keep you insulated in damper conditions. Slip an Aeros Pillow into the hood and enjoy a great night&';s sleep - wherever your travels take you. RDS-certified, 650+ fillpower duck down with a non-PFC Ultra-Dry Down treatment to stay drier in damp conditions Includes a recycled 20D polyester shell with a non-PFC DWR finish blocks wind and moisture, while the polyester liner provides pure comfort. Free-Flow Zip System offers great temperature regulation and multiple sleeping bag configurations Semi-rectangular fit is designed for spacious comfort when you&';re camping or traveling Sea to Summit Guarantee is offered for the Lifetime of this product BEST USE Camping, Overlanding, Van Life COMES WITH Ultra-Sil(TM) Compression Bag & Storage Cell INSULATION RDS certified, 650+ PFC free Ultra-Dry Down SHAPE Relaxed Mummy ZIP OPTIONS Free-Flow zipper system 30AdegF REGULAR 30AdegF LONG BAG WEIGHT 2lbs 7.5oz 2lbs 12.2oz COMPRESSED VOLUME 8.2 L 8.8 L COMPRESSION SACK 13 L 13 L FILL WEIGHT 13.4 oz 15.4 oz FITS UP TO HEIGHT 6 ft 1 in 6 ft 6 in TEMPERATURE RATING (EN LOWER LIMIT) 30AdegF 30AdegF WOMEN&';S TEMP RATING (EN COMFORT) 37AdegF 37AdegF