Boxing gloves are typically available in sizes of 10, 12, 14, 16, and 18 ounces, allowing you to graduate from concentration mitts to heavy bag sessions to sparring (generally 16 to 18 oz and above). Those that weigh more than 20 oz. Are better suited for sparring. The most important factor in choosing boxing glove sizes is your own hand size. When choosing which size to buy, be sure to check the label inside the packaging of each pair of gloves. This will tell you whether or not they are adjustable and thus suitable for someone else other than their owner. If they are not adjustable, then you should get sizes larger than what you normally wear because the fingers on boxing gloves tend to stretch over time with use. Adjustable boxing gloves are very useful if you have small hands like me. I can usually fit my entire hand in an 18-inch boxers size glove. Larger people may need to go up a size too. It's best to err on the side of caution and get a pair that is going to be large enough for you. It's not worth it to buy a pair of gloves that are too small otherwise you might not be able to get your hands into them at all! Also remember that the thicker the glove, the heavier it is.