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If you've ever wished for a less-constrictive sleeping bag that keeps you comfortable in a variety of cool-to-warm conditions, the Sea to Summit women's Trek may become your go-to bag. The Free-Flow Zip system allows unparalleled ventilation so you can open up a Trek to use as a quilt in warmer weather, or secure the snaps around your shoulders, open the footbox zipper and 'wear' the Trek around camp. 650+ fill power duck down with a non-PFC Ultra-Dry Down treatment keeps you insulated in damp conditions. Couple a women's Trek to a unisex Trek for the perfect two-person camping/travel sleep environment. Slip an Aeros Pillow (sold separately) into the hood and enjoy a great night's sleep - wherever your travels take you.