Size S:
Inside dimensions : 80mm x 65 mm
Outside dimensions : 110 mm x 8 0mm
Size M :
Inside dimensions : 9 0mm x 70 mm
Outside dimensions : 125mm x 90mm
Size L :
Inside dimensions : 205 mm x 85 mm
Outside dimensions : 245 mm x 100mm
Measurement and actual size have error of 0.5 cm, belong to the normal