Joe's USA - Youth Polos - School Uniform Shirts in 14 Colors Sizes Youth XS-XL Joe's USA - Youth Polos in 14 Colors. Sizes Youth XS-Youth XL. our comfortable classic polo is anything but ordinary. With superior wrinkle and shrink resistance, a silky soft hand and an incredible range of styles, sizes and colors 5-ounce, 65/35 poly/cotton pique. Flat knit collar and cuffs 2-button placket on XS-M. 3-button placket on L-XL Metal buttons with dyed-to-match plastic rims. Double-needle armhole seams and hem. Side vents Youth Sizes: XS (4), S(6-8), M(10-12), L(14-16), XL(18-20)