Cap tan
From Openwaterpedia
noun - A cap tan is the division on a swimmer's forehead between the skin of pronounced paleness relative to the rest of their face that has been suntanned by prolonged exposure to ultraviolet radiation in a pool, outdoors or in the open water.
The young woman had a clear cap tan after her long workout in the pool.
Synonym
Swim cap tan. Also related to Goggle tan.
