OFFICIAL LaserPerformance YOUTH POLO. A tried-and-true customer favorite, our comfortable classic sport shirt is a first-rate choice for uniforming just about any group. 5-ounce, 65/35 poly cotton pique, Knit collar and cuffs, Double-needle armholes and bottom hem, Side vents, Metal buttons with dyed-to-match rims Youth sizes: XS (2-4), S(6-8), M(10-12) 2-button placket; L(14-16), XL(18-20) 3-button placket