Due to hazardous materials shipping restrictions, we do not sell IsoPro online. To purchase, please see your Dealer Locator. MSR IsoPro is a performance-boosting, 80/20 blend of isobutane and propane, with the purest isobutane (5% or less n-butane) of any canister fuel. This clean-burning formulation maintains higher internal pressure at lower temperatures than standard butane/propane mixtures, delivering superior cold weather performance and more consistent output over the life of the canister. WARNING: Cancer and reproductive harm. Learn more about Prop 65

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