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Racing flats, or simply flats, are lightweight athletic shoes designed for "long distance" track and field, cross country, and most often, road races. They differ from normal training shoes mainly by the lack of a substantial heel (hence the name). They tend to be of less substantial construction and so have shorter natural lives. But this is mitigated by the gentleness of ground contact of the runners that use them. They are mostly sold as "for use up to 10k", but are used by some runners at any distance, including ultramarathons.〔(【引用サイトリンク】 author=Anton Krupicka )〕 ==Construction== Racing flats have only small or no heel lift and little padding or support. They allow a prepared athlete to use their natural foot strength, elasticity, and proprioception to run quickly. A typical flat consists of just a nearly flat sole, and a minimal upper to hold it onto the foot. Frequently the thin insole is glued in place to reduce movement and weight. The uppers are often mesh so that moisture can escape, even on crosscountry variants. Racing flats vary in weight, ranging from 230g (7-8 oz) down to the mere 70g (2.46 oz) of the women's New Balance 5000. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Racing flat」の詳細全文を読む スポンサード リンク
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