Country music singer-songwriter Eric Church often wears Ray-Ban RB3025 Aviator sunglasses while performing on stage.

The Ray-Ban Aviator sunglasses with brown gradient lenses used to be his most used sunglasses, but he also sometimes wears black frame Aviators.

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Black sunglasses
The last few years, Eric Church has changed to black Ray-Ban RBRB2132 New Wayfarer (read more).

Why does Eric Church wear sunglasses?
Church once said in an interview that he wears his signature aviator sunglasses as a result of wearing contact lenses. When his career was getting started, he was forced to deal with the heat from the stage lights drying out his contacts. As he began performing in larger venues, his aviators and Von Dutch denim trucker hat became his trademark.

Reference: Ray-Ban RB3025 Aviator Gradient, arista / brown gradient