b'How to MeasureHair LengthTop Length Nape Length Overall LengthMeasure from theMeasure from theMeasure from the crown of the head tonape of the neck tocrown of the head to the end of the rstthe end of the hair. end of the longest layer of hair. If the hairlayer of hair.is layered this measurement will be shorter than the overall lengthSilicone Caps Susan Sil-Stay & Sil-Active Measurement Guide for Medium, Small, and X-Small CapsMedium (Average) Cap MeasurementsCircumference Front - Nape Ear - Crown - Ear Ear - Front - Ear Temple - Back - Temple21 (53.3cm) 13 1/4 (33.6cm) 12 1/4 (31.1cm) 11 5/8 (29.5cm) 15 (38.1 cm)Small (Petite/Adult) Cap MeasurementsCircumference Front - Nape Ear - Crown - Ear Ear - Front - Ear Temple - Back - Temple20 1/2 (52.1cm) 12 3/4 (32.4cm) 11 3/4 (29.8cm) 11 1/2 (29.2cm) 14 3/4 (37.5cm)Extra Small (Child) Cap MeasurementsCircumference Front - Nape Ear - Crown - Ear Ear - Front - Ear Temple - Back - Temple22 19 3/4 (50.2cm) 12 (30.5cm) 11 5/8 (29.5cm) 10 5/8 (27cm) 14 1/2 (36.8cm)'