These bendy nose things, how far should I bend them?
The malleable nose clip deforms easily so that a good fit can be formed around the bridge of the nose. Continuous or exaggerated deformation will eventually cause failure in the metal – it will snap. Once a good fit has been found, it is best to maintain the shape, rather than folding it flat when storing it or when not in use.
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Yes, a good idea not to bend it too much. But its difficult to prevent folding the mask when out and about. I would recommend a design change.