With the introduction of X20i comes the most comfortable ear tip we haveever designed. Pre-installed on the product, we have redesigned our mostpopular ear tip into a super slim form factor. After extensive research, oursurveys lead to the conclusion that ear canals are even narrower than wehad ever expected. The super slim ear tip addresses that by using an evennarrower and more tapered design, enabling people who have never foundin-ear monitors to be comfortable to wear them without fatigue. However,all ears are unique, so included with the product are five additional sizes tochoose from.