Navy Island Navy Strength is a 100% pure Pot Still rum. The blend is made from 11 carefully selected – small batch distilled – rums of various ages. This rare 100% pure Pot Still rum is bottled at Navy Strength for intense flavour and maximum enjoyment. Navy Strength refers to rum that is bottled at exactly 57% alcohol by volume. Navy Island Navy Strength is a gorgeous rum that represents the best traditional craftsmanship has to offer. The beautiful bottle and lush, appealing label are supplemented by a lovely cylindrical gift case.