A Hair roller is a small roller

Roller

The rollers are an Old World family, Coraciidae, of near passerine birds. The group gets its name from the aerial acrobatics some of these birds perform during courtship or territorial flights. Rollers resemble crows in size and build, and share the colourful appearance of kingfishers and...

 used in hair care

Hair care

Hair care is an overall term for parts of hygiene and cosmetology involving the hair on the human head. Hair care will differ according to one's hair type and according to various processes that can be applied to hair...

 for styling and curling hair, and with a blowdryer

Blowdryer

A blowdryer or hairdryer is an electromechanical device designed to blow cool or hot air over wet or damp hair, in order to accelerate the evaporation of water particles and dry the hair. Blowdryers allow to better control the shape and style of hair, by accelerating and controlling the formation...

. It can be made from synthetic sponge or plastic covered with velcro

Velcro

Velcro is the brand name of the first commercially marketed fabric hook-and-loop fastener, invented in 1948 by the Swiss electrical engineer George de Mestral...

.

Hair curling

Hair rollers work by breaking down the hair's hydrogen bond

Hydrogen bond

A hydrogen bond is the attractive interaction of a hydrogen atom with an electronegative atom, such as nitrogen, oxygen or fluorine, that comes from another molecule or chemical group. The hydrogen must be covalently bonded to another electronegative atom to create the bond...

s, found in the hair's cortex, which cause hair to bend and become curly. Once the bonds are broken, hair is prevented from holding its original, natural form; however, the hydrogen bonds can re-form if exposed to moisture.

Electric hair rollers

Electric hair rollers are also called Heated rollers. A heated roller is a tool used to curl the hair with the help of the heat. There are different diameter

Diameter

In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle...

 of hair rollers.The roller's diameter can be anywhere from 0.8 inches (20.3 mm) to 1.4 inches (35.6 mm).Hair rollers are typically used to give shape and volume to a hairstyle

Hairstyle

A hairstyle, hairdo, or haircut refers to the styling of hair, usually on the human head. The fashioning of hair can be considered an aspect of personal grooming, fashion, and cosmetics, although practical, cultural, and popular considerations also influence some hairstyles.-History of...

.

In 1966, the first electric hair rollers were produced by Panasonic

Panasonic

Panasonic is an international brand name for Japanese electric products manufacturer Panasonic Corporation, which was formerly known as Matsushita Electric Industrial Co., Ltd...

 in Japan; these are called Hot curlers.

In 2009 a new heated hair roller system was developed by unil electronics and distributed and sold by Cloud Nine Hair TheO by Cloud Nine Hair. The roller pod heats hair rollers through induction technology and is a considerable advancement in hair roller technology.

Hair roller brands

• Conair
  Conair Corporation
  Conair Corporation is a US-based multinational corporation which sells small appliances, personal care products, and health and beauty products for both professionals and consumers...
  
   (Babyliss)
• Remington
  Remington Products
  Remington Products, commonly known as simply Remington, is a worldwide personal care corporation which manufactures razors , epilators, and haircare products for both men and women. It is a subsidiary of Spectrum Brands.-History:...
  
  
• Cloud Nine Hair
  Theo
  Theo is a given name, deriving from the Greek word Theos which means god, short for many different names in which 'Theo-' is the first element, for example:*Theodore*Theodosius*Theophilus*Theophile*Theodora*Theodotus...
  
  
• Curlformers