If you haven't used in ear monitors before don't worry, like everyone else after your first few days of figuring out how to get them in and out you'll be an expert on custom earphones. You will never want to go back to generics, headphones or stage wedges again!
Custom in ear monitors (IEM's) are the main choice for professional musicians due to being the most discreet and comfortable option with the best isolation and stunning audio reproduction. However there has been some negative research into the occlusion effect and pneumatic air pressure causing ear fatigue and potential hearing loss
So this is where the fun begins... there are now many different types of technologies from many custom IEM companies to combat this occlusion & pneumatic pressure buildup within your ear when using custom or very well fitted earphones.Custom In Ear Monitors