kleosathletics@gmail.com

WELCOME TO KLEOS

KLEOS™ was founded in September 2025 in the fight capital of the world—Las Vegas—by “Jazzy” Jeff Mayweather and a friend. As a member of the legendary Mayweather boxing family and a former world champion, Jeff is keeping his legacy alive through premium Kleos boxing wear built for discipline, resilience, and pride. Beyond the ropes, Kleos is committed to giving back—supporting at-risk youth and local boxing communities by donating to gyms and nonprofit organizations that keep kids in the ring and off the streets. Every piece represents a continuation of the Mayweather legacy and a pledge to champion the next generation.

Jeff Mayweather
IBO Junior Lightweight Champion 1994

"Jazzy" Jeff Mayweather had a career boxing record of 32–10–5 (10 KOs). His biggest accomplishment was winning the IBO junior lightweight title from John Roby on April 21, 1994, a title which he defended two times.
After a successful career in the ring, Mayweather followed in the footsteps of his brothers and became a trainer. Known as the "Quiet Mayweather" Mayweather has trained several champions including Sultan Ibragimov, Celestino Caballero and for a short period Floyd Mayweather Jr.
Jeff Maywearther grew up in Grand Rapids, MI. Jeff is the youngest brother of the boxing trio; FLoyd Mayweather Sr, Roger Mayweather, and Jeff.
Floyd Mayweather Sr. was the first to get into boxing which stemmed from Floyd getting into a fight with a teacher in high school. Floyd Sr. was sent to a detention center and was told either he can go to juvi or choose to get into boxing. Floyd Sr. fell in love with boxing. The Mayweather legacy is history from here.

Floyd Sr. turned pro in 1974 fighting int he welterweight division. The middle brother, Roger Mayweather, followed shortly after. Roger was the trouble maker of the three and loved fighting. Roger followed Floyd Sr. to the boxing gym and began training. Roger Mayweather turned pro in 1981 and was a two-division world champion, having held the WBA and The Ring super featherweight titles from 1983 to 1984, and the WBC light welterweight title from 1987 to 1989. Additionally he held the IBO light welterweight title in 1994, and the IBO welterweight title from 1994 to 1995.

Being the youngest of the three, "Jazzy" Jeff Mayweather began his boxing training in 1983. Jeff turned pro shortly after his brother Roger. Jeff Mayweather had a career boxing record of 32–10–5 (10 KOs). His biggest accomplishment was winning the IBO junior lightweight title from John Roby on April 21, 1994, a title which he defended two times.

Our Values

At KLEOS™, our values are forged in the ring. Discipline fuels the work—rep by rep, day by day. Resilience keeps us moving forward when life counters. Legacy reminds us we’re building more than apparel—we’re carrying stories that outlast a single fight. And Glory isn’t the spotlight; it’s the pride of doing it right and giving back to keep kids in the ring and off the streets.
  • DISCIPLINE100%
  • RESILIENCE100%
  • LEGACY100%
  • GLORY100%
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