KLEOS ATHLETICS
A life in boxing.
A legacy you carry.
FROM THE RING. INTO EVERYDAY LIFE.
Built in boxing.
Worn beyond
the ring.
Co-founded by Jeff Mayweather, KLEOS carries the principles of a lifetime in boxing into what comes next. Discipline. Courage. Respect. A legacy earned through the work.
Shop on the official KLEOS Athletics website.
01 / THE MEANING
κλέος / ˈklē-osWhat will you
be remembered for?
Glory.
Renown.
Legacy.
The ancient Greek idea behind the name is an enduring reputation, earned through character and contribution. For KLEOS, it lives in the choices you make, the work you put in and what you leave for others.
THE KLEOS PHILOSOPHY02 / JEFF × KLEOS
Built from a life
inside boxing.
FIGHTER.
CHAMPION.
TEACHER.
CO-FOUNDER.
Jeff Mayweather and Mendy Douglas founded KLEOS Athletics in Las Vegas in September 2025.
Jeff’s experience runs from winning the IBO junior lightweight title to teaching fighters in the gym. Decades spent learning, competing and coaching give the brand its starting point: a real understanding of the work behind the sport.
KLEOS brings those principles into an independent apparel brand. The connection is personal, with Jeff involved as a co-founder and boxing at the heart of its identity.
MEET JEFF03 / THE KLEOS CODE
Six principles.
One standard.
- 01
LEGACY
Build something that carries forward.
- 02
DISCIPLINE
Return to the work. Especially on the hard days.
- 03
RESPECT
Honor the craft and the people beside you.
- 04
COURAGE
Take the next step through uncertainty.
- 05
COMMUNITY
Make room for someone else to rise.
- 06
EXCELLENCE
Keep refining. Hold yourself to the standard.
04 / THE MAYWEATHER LEGACY SERIES
Floyd
Mayweather Sr.
The story before the glory.
The series looks at the people and stories behind boxing’s lasting names. Its first chapter honors Floyd Mayweather Sr.—a fighter, a trainer and a defining presence in the Mayweather family’s boxing history.
EXPLORE THE LEGACY SERIES Jeff and Roger Mayweather collections are announced as coming soon on KLEOS.05 / THE UNIFORM
KLEOS Core.
Training essentials. Everyday pieces.
A few ways to carry the code.
Built Not Born Tee ↗
The oversized silhouette.
Performance Tee ↗
For the work inside the gym.
DNA Emblem Cap ↗
A quiet signature.
Explore current releases, sizes and availability at the official KLEOS store ↗.
06 / WEAR YOUR LEGACY
The work stays
with you.
For fighters and trainers. For students of the sport. For people building something of their own. Boxing is where these principles took shape; everyday life is where you keep putting them to use.
Discipline travels.
So does KLEOS.
07 / THE NEXT GENERATION
Legacy is what
you leave behind.
A safe place to train.
A coach who believes in you.
A chance to find your footing.
KLEOS’s community mission focuses on youth boxing: helping young people access the coaching, structure and confidence the gym can offer.
The KLEOS Cares plan includes support for gym fees, coaching and gear. Its published commitment is to begin donations once the business is profitable, with partners and impact shared on the official site.
YOUR NAME IS WHAT YOU’RE GIVEN.
Your legacy is
what you earn.
WEAR YOUR LEGACY.