Add a pin for a cramped leg

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Many swimmers love waves, yet waves may be dangerous. For instance, they often come with a powerful back current.
As wwve lovers don't like to wear traditional life vests, many of them lose their life to a back current or other dangers.
Ultraslim life west may solve the problem and save many lives.
When deflated, it wouldn't prevent a swimmer from enjoying waves. If a back current took a swimmer far from the shore, he/she would inflate the life west and reach the shore safely.