Size chart:
S: hoop circumference is about 18cm/7.08inch; elastic adjustment range is about 6-8cm/2.36-3.14inch
M: hoop circumference is about 30cm/11.81inch; elastic adjustment range is about 9-15cm/3.54*5.90inch
L: hoop circumference is about 34cm/13.38inch; elastic adjustment range is about 9-15cm/3.54*5.90inch
