rash guard
US /ˈræʃ ˌɡɑːrd/
UK /ˈræʃ ˌɡɑːrd/
1.
a type of athletic shirt made of spandex and nylon or polyester, used for protection against rashes caused by abrasion, or by sunburn from extended exposure to the sun
:
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He wore a long-sleeved rash guard for his surfing lesson.
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A rash guard helps protect your skin from the sun and board abrasions.