Mammut Protect Fiber Bag

The central 2-way zipper allows you to open the bag from either the top or the bottom, making it much easier to vent heat or seal yourself in without struggling with side-entry zippers. This intuitive placement is particularly helpful if you tend to overheat during the night and need to quickly adjust your comfort level.

Yes, the polyester synthetic insulation is an excellent choice for damp environments. Unlike down, which can lose its loft and warmth when wet, this synthetic fill retains its insulating properties even if it gets slightly damp, keeping you warm throughout the night.

The anatomical foot box is shaped to accommodate the natural position of your feet while you sleep, preventing the insulation from being compressed. This design provides extra room for your feet to move comfortably without adding unnecessary bulk or weight to the bag.

The hood is constructed from a soft, specialized material designed to minimize the crinkling noise often associated with sleeping bag fabrics. By reducing this auditory distraction, it helps create a quieter, more restful environment for sleeping.

The magnetic closure on the insulation collar allows you to secure the draft collar around your neck quickly and easily without fumbling with snaps or velcro. It effectively seals in your body heat while remaining simple to open if you need to vent.

The -21C rating indicates the limit at which the bag is designed to keep you safe from extreme cold, but personal comfort varies significantly based on your metabolism, what you are wearing, and the sleeping pad you use. For the best experience, we recommend pairing this bag with an insulated sleeping pad that has a high R-value.