A shoe is an item of footwear evolved at first to protect the human foot and later, additionally, as an item of decoration in itself. The foot contains more bones than any other single part of the body, and has evolved over hundreds of thousands of years in relation to vastly varied terrain and climatic conditions. Together with the proprioceptive system, it is what makes balance and ambulation possible.

Until recent years, shoes were not worn by most of the world's population—largely because they could not afford them. Only with the advent of mass production, making available for the first time the cheap flip-flop -type sandal, for example, has shoe-wearing become predominant.

The design of shoes has varied enormously through time, and from culture to culture, with appearance originally being tied to function. Additionally fashion has often dictated whether shoes have, for example, very high heels or no heels at all. Contemporary footwear varies in style, complexity and cost, from the most basic sandal, via high fashion shoes for women sometimes costing thousands of dollars a pair, to complex boots specially designed for mountaineering or skiing. Shoes have traditionally been made from leather, wood or canvas, but are increasingly made from rubber, plastics, and other petrochemical-derived materials.

History

The earliest known shoes date from about 8000 to 7000 BCE and were found in Oregon, USA in 1938. However, tanned leather, the material most commonly used for making shoes, does not normally last for thousands of years, so shoes were probably in use long before this. Physical anthropologist Erik Trinkaus believes he has found evidence that the use of shoes began in the period between about 40,000 and 26,000 years ago, based on the fact that the thickness of the bones of the toes (other than the big toe) decreased during this period, on the premise that wearing shoes resulted in less bone growth (shorter, thinner toes.)

The earliest designs were simple affairs, often mere "foot bags" of leather to protect the feet from rocks, debris, and cold. Since shoes use more leather than sandals, their use was more common in cold climates. By the Middle Ages, turn-shoes had been developed with toggled flaps or drawstrings to tighten the leather around the foot for a better fit. As Europe gained in wealth and power, fancy shoes became status symbols. Toes became long and pointed, often to ridiculous proportions. Artisans created unique footwear for rich patrons, and new styles developed. Eventually the modern shoe, with a sewn-on sole, was devised. Since the 17th century, most leather shoes have used a sewn-on sole. This remains the standard for finer-quality dress shoes today. Until around 1800, shoes were made without differentiation for the left or right foot. We now call such shoes, "straights". Only gradually did the modern foot-specific shoe become standard.

Since the mid-20th Century, advances in rubber, plastics, synthetic cloth, and industrial adhesives have allowed manufacturers to create shoes that stray considerably from traditional crafting techniques. Leather, which had been the primary material in earlier styles, has remained standard in expensive dress shoes, but athletic shoes often have little or no real leather. Soles, which were once laboriously hand-stitched on, are now more often machined stitched or simply glued on.

Parts

Sole

The bottom of a shoe is called the sole.

Insole

See also: Shoe insert and Arch support

The insole is the interior bottom of a shoe, which sits directly beneath the foot. Many shoes have removable and replaceable insoles, and extra insoles are often added for comfort (to control the shape, moisture, or smell of the shoe) or health reasons (to help deal with defects in the natural shape of the foot or positioning of the foot during standing or walking).

Outsole

The outsole is the layer in direct contact with the ground. Dress shoes have leather outsoles; casual or work-oriented shoes have outsoles made of natural rubber or a synthetic imitation. The outsole may comprise a single piece, or may comprise separate pieces of different materials. Often the heel of the sole is rubber for durability and traction, while the front is leather for style. Specialized shoes will often have modifications on this design: athletic cleats have spikes embedded in the outsole to grip the ground; many kinds of dancing shoes have much softer or harder soles.

Midsole

The layer in between the outsole and the insole that is typically there for shock absorption. Some types of shoes, like running shoes, have another material for shock absorption, usually beneath the heel where one puts the most pressure down. Different companies use different materials for the midsoles of their shoes. Some shoes may not have a midsole at all.

Heel

The bottom rear part of a shoe is the heel. Its function is to support the heel of the foot. They are often made of the same material as the sole of the shoe. This part can be high for fashion or to make the person look taller, or flat for a more practical use.

Vamp/upper

Any shoe has an upper part that helps hold the shoe onto the foot. In the simplest cases, such as sandals or flip-flops, this may be nothing more than a few straps for holding the sole in place. Closed footwear, such as boots, sneakers and most men's shoes, will have a more complex upper. This part is often decorated or is made in a certain style to look attractive.

Lateral/medial

The outside part of the shoe is referred to as the lateral and the inside facing part of the shoe is the medial. This can be in reference to either the outsole or the vamp.

Accessories

  • Shoehorn: can be used to insert a foot into a shoe by keeping the shoe open and providing a smooth surface for the foot to slide upon.
  • Shoe tree: placed inside the shoe when user is not wearing it, to help maintain the shoe's shape.
  • Shoe polishing equipment:
  • Overshoes or galoshes: a rubber covering placed over shoes for rain and snow protection.
  • (Orthopedic) shoe insert: insert of various materials for cushioning, improved fit, or reduced abrasion. These include padding and inner linings. Inserts may also be used to correct foot problems.
  • Shoe bag: a bag that protects shoes against damage when they are not being worn.
  • Shoe stretcher: a tool for making a shoe longer or wider or for reducing discomfort in areas of a shoe.
  • Snow shoe: a wooden or leather piece which increases the area of ground covered by the shoe.
  • Shoelaces: a system used to secure shoes.

Types

Dress and casual

Dress shoes are categorized by smooth and supple leather uppers, leather soles, and narrow sleek figure. Casual shoes are characterized by sturdy leather uppers, non-leather outsoles, and wide profile.

Some designs of dress shoes can be worn by either gender. The majority of dress shoes have an upper covering, commonly made of leather, enclosing most of the lower foot, but not covering the ankles. This upper part of the shoe is often made without apertures or openings, but may also be made with openings or even itself consist of a series of straps, e.g. an open toe featured in women's shoes. Shoes with uppers made high to cover the ankles are also available; a shoe with the upper rising above the ankle is usually considered a boot but certain styles may be referred to as high-topped shoes or high-tops. Usually, a high-topped shoe is secured by laces or zippers, although some styles have elastic inserts to ease slipping the shoe on.

Men's

Men's shoes can be categorized by how they are closed:

  • Balmorals (American English), Oxfords (British English): the vamp has a V-shaped slit to which the laces are attached; also known as "closed lacing". The word "Oxford" is used by American clothing companies to market shoes that are not Balmorals, such as Blüchers.
  • Blüchers (American), Derbys (British): the laces are tied to two pieces of leather independently attached to the vamp; also known as "open lacing".
  • Monk-straps: a buckle and strap instead of lacing
  • Slip-ons: There are no lacings or fastenings. The popular loafers are part of this category, as well as less popular styles, such as elastic-sided shoes.

Men's shoes can also be decorated in various ways:

  • Plain-toes: have a sleek appearance and no extra decorations on the vamp.
  • Cap-toes: has an extra layer of leather that "caps" the toe. This is possibly the most popular d

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