Tan line

Tan lines are usually an unintentional result of a work environment or recreational activities, but are sometimes intentional.

[1] The farmer's tan usually starts with a suntan covering the exposed parts of the arms and neck.

Tennis and golf additionally cause recognizable tans on the middle section of the legs due to the wearing of shorts and socks for prolonged hours in the sun.

[2] The "Texas tan" is similar, with the exception that the shoulders are also affected by the sun, caused by working outdoors while wearing a sleeveless shirt.

[3] "Racing stripes" may refer to the portion of a bikini tan line exposed when wearing one-piece swimwear.

With between 3 and 5 hours spent out on the course in direct sunlight, sunburn, poor tan lines, and heat exhaustion are regular occurrences for the unprepared golfer.

The naturist movement provides completely nude, clothes free sunbathing opportunities in most countries.

Tan-through swimwear typically allows more than one-third of UV rays to pass through (equivalent to SPF 3 or less), and an application of sunscreen even to the covered area is recommended but not for all types of tan through fabric.

A woman at the Iowa State Fair wears a backless dress revealing her swimsuit tan lines.
A farmer's tan
A close-up photograph of a man's right foot. The foot is tanned, with clear tan lines visible where the sandal straps have been. The toes and the top of the foot are darker than the areas covered by the sandal straps, creating a distinct pattern.
Tan lines created by a bikini
Sunscreen on back under normal and UV light