A lightweight pith helmet is a type of headgear traditionally worn in tropical climates to protect the wearer from the sun. It is made from a lightweight material called pith, which is derived from the spongy tissue of certain plants. The helmet is typically designed with a wide brim and a ventilated crown to keep the wearer cool. It is also often decorated with a band or feather plume. The lightweight pith helmet is still popular today as a fashion accessory.