Kodiak Canvas camping tents are made with a premium, marine-grade, 100% cotton duck, Hydra-Shield TM canvas. Just what is Hydra-Shield Canvas? It is a custom-made woven and also managed canvas ideal for the purpose of premium tent building. It is double-fill (2 threads twisted with each other for exceptional strength, longevity, and also a very tight weave). It has a silicone, dry-finish treatment that is watertight, breathable, and long lasting. It additionally withstands mold and mildew and mold.