Sizing: RB50

Size Fighter's Weight Hand Circumference
S Up to 135 lb (60 kg) max 8.5" (21.5 cm)
M 135-154 lb (60-71 kg) max 9" (23 cm)
L 160-190 lb (75-85 kg) max 10" (25.5 cm)
XL Over 200 lb (91 kg) max 10.75" (27.5 cm)