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TLDR: Never ever use a chest harness alone. It depends on what you mean by effective: It can stop a fall, there was a time (before the seventies) when chest harnesses (alone) were used in mountain...
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TLDR: Never ever use a chest harness alone. It depends on what you mean by effective: It can stop a fall, there was a time (before the seventies) when chest harnesses (alone) were used in mountain...