What action aids in earplug insertion by straightening the ear canal?

Pulling upward and outward on the pinna is the action that aids in earplug insertion by helping to straighten the ear canal. This technique increases the diameter and the straightness of the ear canal, making it easier for the earplug to fit comfortably and effectively, ensuring a better seal and enhanced noise isolation. The upward and outward motion changes the angle of the ear canal, which is particularly beneficial because the canal has a natural curve. Proper alignment during insertion can significantly improve the user experience and effectiveness of the earplug.