Band Size /Fit Wrist Size /Fit Official Number
38mm/40mm(S) 5.12"-5.51"(130mm-140mm) 1-2-3
38mm/40mm(M) 5.51"-6.1"(140mm-155mm) 3-4-5
38mm/40mm(L) 6.1"-6.49"(155mm-165mm) 5-6-7
38mm/40mm(XL) 6.49"-6.88"(165mm-175mm) 6-7-8
42mm/44mm(S) 5.51"-6.1"(140mm-155mm) 3-4-5
42mm/44mm(M) 6.1"-6.49"(155mm-165mm) 5-6-7
42mm/44mm(L) 6.49"-6.88"(165mm-175mm) 7-8-9
42mm/44mm(XL) 7.08"-7.87"(180mm-200mm) 9-10-11