There is nothing special about putting Active Noise Canceling (ANC) technology into IEM - Sony does it, Audio Technica does it, Panasonic does it, Pioneer does it (you get the idea)... and apparently, Wolfson Electronics, the company best known for its DAC chips, is doing it as well. The sub-brand is called Digital Silence, and it already has a model in the market since mid 2011. The company now announced a new model called DS-421D with more advanced features, and as expected, it will pack a Wolfson chip inside to do all the ANC magic. The only question is, does it comes with an iron man certification?
Head to engadget for the whole list of features.