Same as the standard Snugpak Bivvi Bag, but with the added versatility of a half-length zip, wider in the chest, ideally suited for use with the Antarctica RE and the Special Forces System. The Special Forces Bivvi Bag is made of the same Paratex Dry material as our standard Bivvi Bag. Paratex Dry a technical, lightweight, durable, 100 percent waterproof fabric that is Exceptional breathable to ensure the user is comfortable in all conditions.