Size table: hand circumference.
M: 19.5 - 21.5 cm / 7.7 - 8.5 inches.
L: 21.5-23 cm / 8.5-9 inches.
XL: 23-24.5 cm / 9-9.6 inches.
XXL: 24.5-26 cm / 9.6-10.2 inches.
Use a tape measure to measure your hand circumference, and choose the appropriate size according to your hand circumference.