Which member of U2 normally wears a woolly hat on stage?

David Howell Evans, better known by his stage name The Edge (or just Edge), is a British-born Irish musician and songwriter best known as the lead guitarist, keyboardist and backing vocalist of the rock band U2. He is know for wearing a woolly hat whilst performing on stage. A member of the group since its inception, he has recorded 13 studio albums with the band as well as one solo record. As a guitarist, the Edge has crafted a minimalistic and textural style of playing. His use of a rhythmic delay effect yields a distinctive ambient, chiming sound that has become a signature of U2's music.

The Edge was born in England to a Welsh family, and was raised in Ireland after the Evans family relocated there while he was still an infant. In 1976 at Mount Temple Comprehensive School he formed U2 with his fellow students and his elder brother Dik. Inspired by the ethos of punk rock and its basic arrangements, the group began to write its own material.