TRAIT ANALYSIS As well as send­ing 10 pairs of each shoe to run­ners for trial, we an­a­lysed the fol­low­ing data from our US lab

Men's Health (UK) - - Agenda -

DEEP IM­PACT

To mea­sure cush­ion­ing, a ma­chine drops an 8.5kg weight onto the heel and fore­foot of each pair to gauge how the mid­sole com­presses.

SIZE MAT­TERS

We weighed men’s size eight mod­els and cut away the up­per to find heel and fore­foot thick­ness. This gives us the ‘heel drop’.

FLEX AP­PEAL

The fore­foot is bent to 45 de­grees 60 times in 20sec. The force needed tells us how smoothly a shoe moves from heel strike to toe- off.

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