Koss The Plug

Pros: Earplug design blocks out ambient noise and fits snuggly

Cons: The cord seems to be coated with an adhesive such that it tangles easily. The mute button is overly sensitive engages with the slightest touch (or gust of wind).

Summary: I know this these are low-end earphones, but they are made by the "first name in earphone design." There is no excuse for such poor workmanship and material.
The mute button actually needs to be tapped in order to get it to fully disengage and instead of a carrying case, they use "twist-ties" to keep the cord from invading your space. Would it really have cost that much more to make a good pair of earphones?