Do glider pilots require normal headsets?
No, but a hat to protect the head from the sun. You may call this the glider pilot's headset ;-)



Glider pilot with hat (picture source)

The flight noise is just a faint hissing sound, and the most noise is either produced by the electrical variometer or the radio. On a busy day and with everyone on the same frequency, I often switched the radio silent when high up. When you receive transmissions from tens of kilometers away, you often receive parallel transmissions, which result in a very loud and annoying crackling in the radio.