Built by Fighters.
Trusted by Champions.

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Trevor Wittman and Justin Gaethje training for UFC at the ONX gym with ONX gloves and equipment.

Built by Fighters.
Trusted by Champions.

SHOP OUR GEAR   ➔

Built by Fighters.
Trusted by Champions.

SHOP OUR GEAR   ➔

Inside the ONX Lab: Honing Champions RSS

UFC fighter Cory Sandhagen training with coach Trevor Wittman with ONX gear.
MMA WEIGHT CLASSES: THE COMPLETE FIGHTER’S GUIDE

From UFC to ONE Championship, discover every MMA weight class, how they work, and key differences across major promotions in this complete fan guide.

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TREVOR WITTMAN

3X World MMA Awards Coach of the Year
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