Contoured perforated rib and shoulder pads conform to the body * Constructed of 90% polyester, 10% spandex fabric * The breathable mesh moisture management fabric provides a cool comfortable fit * Small 34-36" chest, medium 38-40" chest, large 42-44" chest, X-large 46-48" chest, XX-large 48-50" chest, XXX-large 50-52" chest * Spandex gives you a comfortable tight fit