QuietPro100Ex
The earplug QP100eX will soon be tested in a helicopter cockpit. The plug was primarily aimed for offshoreworkers in an noisy environment, but might be efficient for pilots.
Google QP100eX and you will find interesting data regarding the earplug. Built in ANR, dosimeter that records the amount of noise with a microphone inside the earcanal and built in microphone for speak (no need for mouth microphone).
OMP