This Brooks Brothers men's mid - layer is perfect for guys who want a stylish and comfortable piece of clothing. You can wear it at the driving range while practicing your swings or in the clubhouse when relaxing. It weighs about 8 ounces and is made of a blend of 76% polyester, 22% rayon, and 2% spandex. The cadet collar and unique button vent give it a classic look, and the rounded button cuffs add a touch of style.