M: total length 38CM on the circumference of 23-27CM, the circumference of 13-15CM is suitable for weight less than 60 kg
L: total length 39CM upper circumference 25-29CM lower circumference 15-18CM suitable for weight less than 70 kg
XL: total length 40CM upper circumference 27-32CM lower circumference 18-20CM suitable for weight 70 kg or more
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