(Decanter) - Most wine drinkers in the US only notice the bottle closure if there is a problem, according to new research commissioned by Nomacorc, but contested by natural cork producers. Closures may get many wine professionals foaming at the mouth, but it seems US consumers are not so fussed. Almost all of the 600 regular wine drinkers surveyed by Merrill Partners Research said that closure type is not among their top three reasons for buying a wine. 'The research showed that most core wine drinkers only focus on the closure when it creates a problem,' said Merrill co-founder Pat Merrill. Synthetic closure producer Nomacorc commissioned the study.