protective overshoe worn during wet weather.

a high overshoe worn especially in snow and slush

Galoshes , also known as gumshoes, dickersons, or overshoes, are a type of rubber boot that one slips over their shoes to keep shoes from getting muddy or wet. The word Galoshes might be used interchangeably with boot, especially a rubberized boot. Properly speaking, however, a galosh is an overshoe made of a weatherproof material to protect a more vulnerable shoe underneath and keep the foot warm and dry.