pith helmet
US /ˈpɪθ ˌhelmɪt/
UK /ˈpɪθ ˌhelmɪt/
1.
a lightweight helmet made of pith (the soft tissue from the stems of certain plants) or cork, typically covered with cloth and worn in tropical climates as protection from the sun.
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The explorer wore a pith helmet to protect himself from the scorching sun.
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The old photograph showed a hunter in Africa wearing a classic pith helmet.