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A step-through frame (aka open frame or low-step frame) is a type of bicycle frame, often used for utility bicycles, with a low or absent top tube or cross-bar. Traditionally, bicycles with a step-through frame were known as "Ladies, "Women's", or "Girls, mainly for their advantage to riders wearing skirts or dresses. Bicycles with a high top tube (cross-bar), known as a diamond frame, were known as "Men's", "Gents, or "Boys. As a result of changing clothing styles since the late 20th century, descriptions that describe the frame style, rather than the presumed sex of the rider, are becoming increasingly common.