Here are the specifications & description details:

(1) Ralph Lauren Big Pony #3 Style in Short Sleeves
(2) 10 colors available as in the pic.(black, white, red,yellow, baby blue, sky blue, royal blue, royal blue,pink, green)
(3) 100% cotton. Machine washable. 
(4) Regular Size Available: Size M-L-XL-XXL
(5) Classic-fitting, short-sleeved polo shirt in breathable and durable cotton mesh. 
(6) Two-button placket, ribbed armbands, even-vented hem. 
(7) Our embroidered Big Pony accents the chest.
(8) Embroidered "3" accents the right sleeve. 
(9) mother of pearl buttons with polo on it
(10) new with tags, original poly bags, devanlay wash tags

If you want to mix colors and sizes, pls send us detailed order information when you do the payment. Thanks for your cooeration.