100% Cotton To find the perfect fit first measure completely around your chest right under your arm pits. Adult S = (34/36) Adult M = (38/40) Adult L = (42/44) AdultXL = (46/48) Kid Small = (6/8) Kid Medium = (10/12) Kid Large = (14/16) Availability: Usually ships the next business day. $18.95Size: Adult SAdult MAdult LAdult XLKid SKid MKid L Color: BlueRedGreen Have a Question? Email us. Hours: Monday thru Friday 9 AM to 5 PM (EST) Closed Saturday and Sunday Web www.mountainboardshop.com