Whoop 2016
The swimmer used Whoop before the Rio 2016 Games, and he later told the Whoop podcast he has worn it since 2015.
Strap size and story Source: Nextgov, WHOOP Podcast, Sports Illustrated
Michael Phelps's watches
Sport3 documented facts
Michael Phelps is documented wearing 2 watch lines: Whoop, Omega Seamaster Aqua Terra. Each watch below links to its strap size and story.
Wore the new black-dial Aqua Terra in 41 mm for an interview at Omega's SoHo store, after his wife adopted his 38 mm.
Most common strap size on this line: 20 mm Source: Esquire
Omega Ambassador from 2004
The Olympic swimmer became an Omega ambassador in 2004.
The Omega story Source: Quill & Pad
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