Refer to the below sizing chart to determine your singlet size. Size up if you fall between sizes for growth and comfort.
YS 40 to 60 lbs.
YM 60 to 75 lbs.
YL 75 to 90 lbs.
XS 90 to 110 lbs.
S 110 to 130 lbs.
M 130 to 155 lbs.
L 155 to 185 lbs.
XL 185 to 225 lbs.
XXL 225 to 275 lbs.
XXXL Over 275 lbs.