Big Agnes Greystone Sleeping Bag

The Greystone is rated for 20°F, making it a solid three-season choice. It is designed to keep you comfortable in cool to cold conditions, though you may want to layer up or use a sleeping bag liner if you are camping in temperatures right at that limit.

Unlike untreated down, which loses its loft and warmth when wet, the 600 fill DownTek insulation is treated to repel moisture. This allows the down to maintain its loft and insulating properties even if it gets slightly damp from condensation or humid air.

The mummy shape is designed to maximize thermal efficiency by keeping the insulation close to your body, which can feel more snug than a rectangular bag. If you are a restless sleeper, you might find it slightly more confining, but the design is essential for maintaining warmth in colder temperatures.

The PFAS-free coating provides a water-repellent finish on the shell fabric, helping moisture bead up and roll off rather than soaking into the material. It is a more sustainable alternative to traditional chemical treatments, offering reliable protection against light moisture without the use of harmful chemicals.

Yes, Big Agnes prioritized sustainability by constructing both the shell and the lining from recycled fabrics. This reduces the environmental footprint of the bag without compromising on durability or performance.