I read a lot on the internet that the gloves that you should use for heavy bag training should be 16oz. I checked on them on the mall and the 16oz are just too big even with hand wraps. Even different brands are the same. When you put your hands in they are very loose. The 12oz fit perfectly but I guess it's too light or small to for heavy bag training. I'm confused since the 16oz or 14oz are too big and loose, It's feels like wearing shoes that are too big for you. What do I really need?
I use 12 or 14 oz gloves for the heavy bag and 16 or 18 oz gloves for sparring. I feel the extra padding on the sparring gloves minimizes head trauma and aren't really needed for working the heavy bag. Of course, unless you have fragile hands, then I'd go with the heavier gloves for the heavy bag as well.
I used to believe in using 16oz gloves for the bag, but I've since changed my opinion. I noticed that, although my shoulders get better conditioning from using heavier gloves, technique and speed aren't getting the work they should be. The 'increase in speed' you find when you go down a glove size is largely an illusion. You also tend to make alterations to technique because you're tired and because the added size means you have less room to punch the bag up close. ..Just a few observations. In sparring, obviously the longevity of your sparring partners outweighs the inconveniences of using large gloves.
How do you make your hands fit on those 18oz? Do sparring gloves have different size even when they weigh heavier? The gloves available here are Twins, Everlast, Windy, and Bulls. They don't specify weather they're training gloves or sparring gloves. Maybe except those Everlast which say Training so how do I know? By the way the sales guy on the malls don't know much about gloves either. There are no dedicated boxer equipment seller near our location. The Everlast refer to sizes as TA: 8, TA: 10, TA 12, etc.
I've never really paid attention to how snugly the gloves fit my hands. As long as your hands are wrapped properly the only thing I'd worry about gloves that are a little too big is the amount of abrasion you'll be getting on your knuckles. And this could be remedied by taping your hands before putting in the wraps. As far as gloves specifications on size/type, our trainer was always the one who ordered for us so I have no clue to be honest. Maybe you could also ask around your gym.
I use 12 oz gloves for when I'm doing anything besides sparring, never ever paid attention to sizes or anything, they've always just fit..