Professional Fish Kill Bag Design Designed as a high-performance fish kill bag to keep your catch cold, fresh, and secure. 0.5'' Closed-Cell Insulation Built with 0.5inch thick closed-cell foam for superior insulation and long-lasting cooling. Premium YKK Zipper – Opens on Both Sides Durable YKK zipper on both sides allow the blanket to fully open for easy loading and unloading of large fish. Heat-Welded Waterproof Inner Lining Inner lining with heat-welded seams for 100% leak-proof performance and easy cleaning. Waterproof Outer Fabric, Blanket Style Durable waterproof outer shell with a flexible blanket design, perfect for tuna, billfish, and other big game fish.