Couple a Women's Specific Trek to a Unisex Trek for the perfect two person camping/travel sleep environment.The Free-Flow Zip system allows unparalleled ventilation so you can open a Women's Trek up to use as a quilt in warmer weather, or secure the snaps around your shoulders, open the footbox zipper and 'wear' the Women's Trek around camp. Design and Details: A Women's specific cut and body-mapped insulation are enhanced by the Free-Flow Zip system. The Women's Trek provides a world of comfort and versatility options RDS-certified, 650+ fillpower duck down with a non-PFAS Ultra-Dry Down treatment to stay drier in damp conditions Free-Flow Zip System offers excellent temperature regulation and multiple sleeping bag configurations Semi-rectangular women's specific fit is designed for spacious comfort when you're camping or travelling Includes lightweight ultra-sil compression bag and storage cell Sea to Summit Guarantee is offered for the Lifetime of this product