The term 'clothes horse' is used to refer to a portable frame upon which wet laundry is hung to dry by evaporation. The frame is usually made of wood, metal or plastic. It is a cheap low-tech piece of laundry equipment, as opposed to a clothes dryer, which requires electricity to operate, or a Hills Hoist, which requires ample space, wind and fine weather. It also served as an alternative to an airing cupboard. In cold, damp seasons and in the absence of central heating, a clothes horse placed by a fireside or a kitchen range provides a place to warm clothing before putting it on. The practice of airing, once ubiquitous in Great Britain, for example, in the constant battle against damp and mold, has become far less common with the advent of central heating and affordable clothes dryers.