You'll notice that nowhere on this page does the company make any claim as to the abilities of this bracelet. This is because the Australian Competition and Consumer Commission forced them to issue a statement last year apologising for making false claims that the bracelets had any effect on performance.
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Obviously I've never bought one and so can't comment on their effectiveness, but luckily the company themselves have:
"We admit that there is no credible scientific evidence that supports our claims and therefore we engaged in misleading conduct" full apology here [...]