|Harness Size||Extra Small||Women's
|Back Length (cm)||35-45||40-50||45-55||50-60|
|Back Length (in.)||13.5-17.5||15.5-19.5||17.5-21.5||19.5-23.5|
Your back length is from your C7 vertebra down your spine to the point level with the top if your iliac crest (hip-bone).
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