A polo shirt is a form of shirt with a collar, a placket neckline with three buttons, and an optional pocket. Polo shirts are usually short sleeved; Golf shirts are commonly made out of mercerized cotton. The placket typically holds three or four buttons, and consequently extends lower than the typical polo neckline. The collar is typically fabricated using a stitched double-layer of the same fabric used to make the shirt, in contrast to a polo shirt collar, which is usually one-ply ribbed knit cotton. Golf shirts often have a pocket on the left side, to hold a scorepad and pencil, and logo there. The t-shirts are soft and comfortable and are available in various colours. Polo T-shirt are also available in custom design and style.