Top-rated YKK nylon coil zippers with durable nickel sliders are used throughout the tent. #10 zippers on the doors and #8 zippers on the windows and vents. Kodiak Canvas tents feature Hydra-Shield Canvas that is made with a superior, marine-grade, 100% cotton. It is a custom woven and treated canvas ideal for the purpose of premium tent making and it is double-fill (two threads twisted together for superior strength, durability, and a very tight weave). It has a silicone, dry-finish treatment that is watertight, breathable, and durable.