page_title: Flange
section_title: Ski boots
hierarchical_section_title: Flange / Ski boots
caption_attribution_description: English: Salomon Divine RS CF alpine boot
context_page_description: A flange is an external or internal ridge, or rim, for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel. Thus flanged wheels are wheels with a flange on one side to keep the wheels from running off the rails. The term "flange" is also used for a kind of tool used to form flanges. Pipes with flanges can be assembled and disassembled easily.
context_section_description: Ski boots use flanges at the toe or heel to connect to the binding of the ski.  The size and shape for flanges on alpine skiing boots is standardized in ISO 5355. Traditional telemark and cross country boots use the 75 mm Nordic Norm, but the toe flange is informally known as the "duckbill". New cross country bindings eliminate the flange entirely and use a steel bar embedded within the sole instead.
caption: The extensions at the toe and heel of this ski boot produce flanges used to clip into the ski bindings.
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