The Snugpak (R) SF Bivvi Bag is perfect for UK Weather Conditions a protecting you from evaporative and convection heat loss and is one of the Ten Essential Items for Hillwalking a Mountaineering. The SF Bivvi bag is the ideal choice for adventure racers, bushcraft and emergency survival. The non-locking 1/2 length front zip allows rapid egress, when every second counts, and you have to move fast. With a small volume and exceptional light weight, it can be folded of packed away as a stalwart item in your race pack, with or without a sleeping bag.
• Half centre zip for quick and easy access (perfect for use with the snugpak special forces range of sleeping bags).  • 100procent waterproof fabric with a Hydro Static Head in Excess of 5000mm (items with a Hydrostatic Head over 1500mm are generally considered waterproof).  • Taped a Sealed Seams  • Tough  • Breathable (will transmit up to 7.5 litres of moisture per m2 per 24 hours)  • Soft to the touch  • Supplied with own stuff sack • Outer Fabric treated with a Durable Water Repellant (water repellency can be maintained by a cool tumble dry after washing and periodic retreatment with suitable after care products such as Nikwax or Grangers)  It is important to note that as this has a solid coating, air cannot pass so care should be taken not to completely seal any Bivvi Bag system, to prevent suffocation.