Ear tips should ideally provide a comfortable yet secure fit in order to achieve optimal sound quality and noise isolation. They should form a tight seal within the ear canal without causing any pain or discomfort. A proper fit ensures that external noise is minimized while preserving audio quality. The ideal fit may vary depending on individual preferences and anatomy; some individuals might prefer deeper insertion while others find shallow insertion more comfortable without compromising performance. It's important that when fitting ear tips, they should neither be too loose nor too tight in order to maintain both comfort and effectiveness during use.