I own one pair of glove of 12 OZ , i have to say that this glove be more than great , and i be not a fan , why i say this : 1 -rrb- best glove this price -lrb- less than 35 buck -rrb- 2 -rrb- the material be very good , they will last very long 3 -rrb- the color be durable , it do not scratch or get 's decolor 4 -rrb- they be very confortable , and they have swet technology -lrb- it mean that even if you swet , they wont smell or stink -rrb- 5 -rrb- you hand be very protected -lrb- the finger and the front part of the hand -rrb- I be undecided about buy the 12 OZ , the 14 OZ or the 16 OZ , I go for the 12 Oz because for heavy bag practice they be the best , why ? because you hand like the heavy bag be very harsh , they need better contact , if you have big glove -lrb- 16 OZ -rrb- there be a lot of space in the glove , and you finger no matter if you have handwrap , be able to move inside , and that might cause you a broken finger or to get hurt -rrb- in the other . so the 12 OZ be perfect for heavy bag . in the other hand , if you want good glove for spar , then you need to buy the 14 OZ or even better 16 OZ glove , because they will make you work more you hand and you 'll gain speed , also no one will practice with you with smaller glove , because the impact of smaller glove be stronger as they have less material you hand impact will be more direct . for heavy bag if you buy the 12 OZ glove , depend on you hand strenght you probably will not need handwrap , because the glove be very confortable as i mention before , and they will fit you hand perfectly . HOW to CHOSE A SIZE ? i have trouble choose the right size , because almost no one publish a review about how to pick the right size so that be the first reazon why i write this . 1 -rrb- if you be less than 5 ' 4 Height go for the 12 to 10 OZ glove for heavy bag , and for spar go for the 14 OZ . 2 -rrb- if you be less than 5 ' 9 height , but 5 ' 5 or more , go for the 12 Oz for heavy bag and the 16 Oz for spar . 3 -rrb- if you be more than 5 ' 9 height for heavy bag use the 12 or the 14 Oz glove depend ond how big or not be you hand , and for spar the 16 Oz . AGAINST , -lrb- this be excellent glove to start boxing or have boxing initial class , in case you have some time practice you might want to pick more prof. glove -rrb- . enjoy they !!!