A plimsoll.

A plimsoll or plimsoll shoe is a type of athletic shoe with a canvas upper and rubber sole, developed as beachwear in the 1830s by the Liverpool Rubber Company (later to become Dunlop).

The shoe was originally, and often still is in parts of the UK, called a sand shoe and acquired the nickname ‘plimsoll’ in the 1870s.

This name derived either because of the colored horizontal band joining the upper to the sole resembled the Plimsoll line on a ship’s hull, or because, just like the Plimsoll line on a ship, if water got above the line of the rubber sole, the wearer would get wet.

In most of English-speaking North America, they are known as sneakers or tennis shoes, depending on the regional dialect.

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