Isopro Fuel Size:4oz wicking interior storm flap and

wicking interior storm flap and zipper garage for chin comfort

and the snapback adjustment gives you the ideal fit

adding a few more travel-friendly features for life on the move

Includes two 4-oz bottles

and over a decade later we have redesigned this best seller to help take your hang to the next level

Isopro Fuel Size:4oz wicking interior storm flap andMSR 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.