Special masks size chart

     1: Head circumference: 55/56 cm
neck circumference: 39/40 cm   (equivalent S)

2: Head circumference: 57/58 cm
neck circumference: 40/41 cm (equivalent S/M)

3: Head circumference: 59/60 cm
neck circumference: 42/43 cm (equivalent M)

4: Head circumference: 61/62 cm
neck circumference: 44/45 cm (equivalent L)

     5. Head circumference: 63/64 cm
     neck circumference: 46/47 cm (equivalent XL)

Advice:

There is a bit room for adjusting the perfect fit at laced masks