The Snugpak Bivvi Bag is the experts choice for outdoor living or emergency survival. Its small volume allows you to pack it for those just in case situations. Its lightweight, waterproof and durable, making an ideal emergency refuge. When youre inside the Bivvi, youll be grateful for its superior technical qualities: -completely windproof, trapping and stopping the movement of warm air -100% waterproof, transferring water vapour from the inside to the outside (due to the temperature differential between inside and out) -Breathable You can rest assured that our Bivvi Bag wont let the elements spoil a restful nights sleep. FEATURES Made of Paratex Dry, a lightweight, durable, 100% waterproof and breathable fabric. It makes an ideal protective shell for any of our sleeping bags, weighing only 340g. Exceptional breathability ensures user comfort in all conditions. Made in the UK. Support UK manufacturing and enjoy superior British quality. Hydro Static Head in Excess of 5000mm (Items with a Hydrostatic Head over 1500mm are generally considered waterproof) Outer Fabric treated with a Durable Water Repellant. (water repellancy can be maintained by a cool tumble dry after washing and periodic retreatment with suitable after care products such as Nikwax or Grangers) Weight: 340g OUTER FABRIC Paratex Dry EXTRA INFO It is important to note that as this solid coating air cannot pass so care should be taken not to completely seal any bivvi bag system to prevent suffocation.