When performing on stage, it's imperative that you can hear what you're playing. In-ear monitors can let everyone on stage hear clearly.
Shure E3 In-Ear Monitor Headphones
The SE215 Sound Isolating Earphones in new purple color deliver clear sound and deep bass with a detachable cable enabling the option to go from wired
SE215SPEPL-RMCE-TW2-SB-US
Shure P4HW Hardwired Beltpack Monitor for PSM 400 System P4HW=
An Introduction To In-ear Monitoring
Shure SE215 Sound Isolating Earphones - Purple – Kraft Music
Shure SE215 Sound Isolating Earphones Overview
SE846 Gen 2 - Sound Isolating™ Earphones - Shure USA
Shure SE215 In-Depth Review
SE112 Professional Sound Isolating Earphones provide great sound and durable build quality through a single dynamic driver. Discrete secure design
SE112-GR-US
Shure P3RA Wireless Bodypack Receiver - H20 Band
How To Setup In Ear Monitors (IEMs)
What are in-ear monitors? - SoundGuys
An Introduction To In-ear Monitoring
SE425 Pro - Professional Sound Isolating™ Earphones - Shure USA