pith helmet
US /ˈpɪθ ˌhelmɪt/
UK /ˈpɪθ ˌhelmɪt/

1.
casque colonial, salacot
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.
L'explorateur portait un casque colonial pour se protéger du soleil brûlant.
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The old photograph showed a hunter in Africa wearing a classic pith helmet.
L'ancienne photographie montrait un chasseur en Afrique portant un casque colonial classique.