Sizing: RB4

Size Fighter's Weight Hand Circumference
XS Up to 100 lb (45 kg) max 7.25" (18.5 cm)
S 100-130 lb (45-60 kg) max 8.25" (21 cm)
M 135-154 lb (60-71 kg) max 9" (23 cm)
L 160-190 lb (75-85 kg) max 9.75" (25 cm)
XL Over 200 lb (91 kg) max 10.5" (26.5 cm)