Canoe and War Canoe[sic] hitpoints increased.
—In-game description

Rawhide Covers is a Big Button technology in Age of Empires III: The WarChiefs that is unique to the Iroquois and can be researched at the Dock once the Colonial Age is reached. Once researched, it increases the hit points of warships (despite the description saying it affects Canoes and War Canoes) by 20%.

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