The pith helmet (also known as the sun helmet, topee, sola topee, salacot or topi) is a lightweight helmet made of cork or pith, typically from the sola (Indian swamp growth, Aeschynomene aspera or A. paludosa) or a similar plant
, with a cloth cover, designed to shade the wearer's head from the sun. Pith helmets were once much worn by Westerners in the tropics; today they are most frequently used in Vietnam. (The forms solar topee and solar topi are folk etymology—the name comes from sola, and is not etymologically connected with the sun in any way.)
Crude forms of pith helmets had existed as early as the 1840s, but it was around 1870 that the pith helmet became popular with military personnel in Europe's tropical colonies. The Franco-Prussian War had popularized the German Pickelhaube, which may have influenced the definitive design of the pith helmet. Such developments may have merged with a traditional design from the Philippines. The alternative name salacot (also written salakhoff) appears frequently in Spanish and French sources and comes from the Tagalog word salacsac (or Salaksak). Emilio Aguinaldo and the Philippine revolutionary military used to wear the pith helmet from the Spaniards alongside the straw hat and the native salakot during the Revolution in the Philippine-American War.
Originally made of pith with small peaks (bills) at the front and back, the helmet was covered by white cloth, often with a cloth band (or puggaree) around it, and small holes for ventilation. Military versions often had metal insignia on the front and could be decorated with a brass spike or ball-shaped finial. The chinstrap could be in leather or brass chain, depending on the occasion. The base material later became the more durable cork (indeed, another common Spanish name literally translates as cork helmet), although still covered with cloth and frequently still referred to as "pith" helmets.
This form of headdress is now associated strongly with the British Empire. However, the pith helmet was used by all European colonial powers, and during the 1880s even by the United States Army
in the south west. It was commonly worn by white officers commanding locally recruited soldiers in the colonial troops of France, Britain, Spain, Portugal, Italy, Imperial Germany and the Netherlands, as well as civilian officials in their tropical territories. White troops serving in the tropics usually wore pith helmets, although on active service they were sometimes replaced by more comfortable and less conspicuous alternatives such as the wide brimmed slouch hats worn by US troops in the Philippines and by British Empire forces in the later stages of the Boer War.
The Home Service Helmet is still worn by some British Army bands or Corps of Drums on ceremonial occasions today. It is closely related to the custodian helmet still worn by a number of police forces in England.
During the Anglo-Zulu War, British troops dyed their white pith helmets with tea for camouflage. Soon khaki-coloured pith helmets became standard issue for service as well.
Pith helmets were widely worn during World War I by British Empire, Turkish, Belgian, French and German colonial troops fighting in the Middle East and Africa.
Helmets of this style (but without true pith construction) were used as late as World War II by European and American military personnel in hot climates. Included in this category are the sun helmets worn in North Africa by Italian troops, South African Army and Air Force units and Germany's Afrika Korps, as well as similar helmets used to a more limited extent by U.S. and Japanese forces in the Pacific Theater. The entire military of the America's colony the Philippines, which consisted of an army and a gendarmerie, used sun helmets. The U.S. Marine Corps used pith helmets called "elephant hats" in the South Pacific. They were also worn by recruits in United States Marine Corps Boot Camp. The Axis Second Philippine Republic's military, known as the Bureau of Constabulary, as well as other guerrilla groups in the Philippines was another user of sun helmets. The British Army formally abolished the tropical helmet in 1948.
British diplomats in tropical postings, Governors General, Governors and colonial officials continued to wear the traditional white helmets as part of their ceremonial white uniforms until the practice died out during the 1970s and '80s. The ceremonies marking the end of British rule in Hong Kong in 1997 were probably the last occasion on which this style of headdress was seen as a symbol of Empire.
After World War II, the Viet Minh of Vietnam based their helmet design on the French pith helmet of the former colonial power and adopted it as their own. Today it is still widely worn by civilians in Vietnam but appears only rarely as part of the military uniform. In design, the Vietnamese model was similar to the pre–World War II civilian type, but covered in jungle green cloth, sometimes with a metal insignia at the front or back.
Sun helmets of plastic material but traditional design are still worn today by some mail carriers of the U.S. Postal Service (USPS). White colored helmets with black ribbons (virtually identical to the one pictured above, belonging to Harry Truman) were the standard duty head gear used by highway traffic officers in the Dominican Republic's National Police up until the beginning of the 21st century, when these units were replaced by the creation of the Autoridad Metropolitana de Transporte (AMET) corps, who use dark green Stetson hats instead.
The pith helmet has also seen use as a form of identification by U.S. Marine Corps rifle range coaches at Parris Island and San Diego, similarly the campaign hat is worn by rifle range instructors as well as drill instructors.
The pith helmet continues to be worn by cadets in senior positions at the Royal Military College of Canada for certain parades and special occasions. Notably, the Cadet Wing Commander, Deputy Wing Commander, Wing Training Officer, Wing Administration Officer, Squadron Leaders, Squadron Training Officers, and the Colour Party.