XXS - approximately 50-60cm
XS - approximately 55-65cm
S - approximately 60-70cm
S/M - approximately 65-75cm
M - approximately 70-80cm
M/L - approximately 75-85cm
L - approximately 80-90cm
L/XL - approximately 85-95cm
XL - approximately 90-100cm
XL/XXL - approximately 95-105cm

Custom sizing can be done. Please contact us.