Double hole cord locks are ineffective. The 1/8 inch elastic goes through with very little tension. This is difficult when you've already threaded it through the elastic sewn into the mask. Other interlocks seem to work. I wouldn't use anything other than 1/8" elastic. . Even 1/4" thick elastic will have a hard time slipping through the clasps if folded in half. This is true for all three types of clasps.
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