are 12 oz gloves good for heavy bag?
While for sparring, a 12oz, 14oz or 16oz can be used. In the 45-50kg range, you can hit bags with an 8oz and spar with a 16oz. The 50-60kg range is pretty similar with just a 10oz for bag work recommended. While for Women over 60 kg, a 12oz glove is best for bag work and 16oz for sparring.