A UFC fighter learned the new armor for his man jewels works just fine ... and it's all 'cause of Cris Cyborg's powerful kicks!!!
Here's the deal ... UFC's Don Madge was in a gym recently and wanted to try out his new cup -- so he asked Cyborg for a helping foot.
Cris reared back and went to kick the dude pretty hard -- but Madge was having none of that ... pulling away at the last second and screaming, "That was way too hard!!"
Don didn't let that deter him .