Runner's World South Africa - - HUMAN RACE -

A fancy ma­chine called a dig­i­tal con­tact sen­sor mea­sures the ‘stack height’, or the to­tal thick­ness of the sole from your foot to the ground, in both the heel and the fore­foot. The ‘drop’ is the dif­fer­ence be­tween the heel and the fore­foot mea­sure­ments, or how much your toes drop below your heel. The least amount of drop in this guide is 0mm for both men and women (Altra King 1.5, Vivobarefoot Primus Swimrun). The great­est amount of drop is 14.4mm for men and 12.9mm for women (Ree­bok Har­mony Road 2).

0mm LEAST 14.4mm MOST

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