T groove size sizing small medium large and x large t groove is the latest edition to the t qualizer family t groove dances to the beat of the music showing off different dance moves with a new funky psychedelic design the t groove is made from 100 cotton it has a fully functional light up panel that reacts to the sound of the music the new designed battery pack has a sound sensitivity dial to adjust the sensitivity of the t groove to make it more diverse for different environment