An underwire bra is a type of bra that has thin rigid material sewn into the underside of the cup of the bra. This rigid material can be made of wire, metal, plastic or resin. The purpose of the wire is to provide additional support for the breasts.
Underwire bras are by far the most popular and best-selling type of bra on the market. This is because in addition to the support they provide, underwire bras have a number of other desirable qualities. Typically, breasts that are a size B cup or larger benefit from the support provided by an underwire.
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