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Running trainers, in comparison with others, are both lighter and more flexible.
Member rating: No Rating | Words: | Submitted: Fri Sep 12 2003
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Introduction: Runners have improved performances with the advent of plastics in sport, as running shoes can now be 50% lighter and 100% more durable than they were 30 years ago. Polyether-block-amide is used in the soles of sports shoes, as it is resistant to flexure and abrasion as well as being lightweight. Polyvinyl acetate foam is used to make inner soles for its shock absorbency and elasticity. Lightweight water resistant plastics are also taking over from the traditional leather as leather was heavier and got even more so when it was water logged. Running trainers, in comparison with others, are both lighter and more flexible. Also, differences range in grip. For example, trainers for skateboarding tend to have far more grip than trainers for Astroturf. Also, many trainers are suitable for many sports such as basketball trainers and running trainers, however some are not suitable for other sports such as football boots. This...
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