Backflow Armor offers one easy step, an insulation backflow pouch that will be sure to withstand the elements. These pouches have double-stitched sewn seams to prevent any of the edges from ripping apart acting in the same manner as a welded or glued type bond. Brass grommets have been installed to ensure rust-proof protection, season after season. The pouch carries a lock that has been installed to prevent cold air intrusion prolonging the freeze time. Compared to the thickness of other competitors, Backflow Armor carries the thickest fiber-reinforced pouch to date. Available in four sizes, Backflow Armor has the perfect insulated pouch for your next project to help prevent damage in your next freeze. Anti-tear outer shell - 2 Time Increased Thickness, Tear and Crack Resistant Thick Insulation - 25.56% more insulation Sewn Edges - Seams are Double Stitched Lock - Lock is used to Seal Off Air Intrusion from the bottom opening of the bag Brass Grommets - Grommets are Rust Proof and Long Lasting Waterproof - Outer Jacket is Made to Repel Water