Equally startling are these numbers: According to Mark Fainaru-Wada and Lance Williams, the San Francisco Chronicle reporters who wrote "Game of Shadows: Barry Bonds, BALCO, and the Steroids Scandal That Rocked Professional Sports," Mike Murphy, equipment manager of the San Francisco Giants, testified that since Bonds became a Giant in 1993, the size of his uniform jersey has gone from 42 to 52. His cap size has expanded from 7 1/8 to 7 1/4, even though while it was expanding he shaved his head. (Bonds reportedly shaved his head because his hair was falling out as a result of steroid use.) And Fainaru-Wada and Williams also say Murphy testified that Bonds's baseball shoe size has changed from 10½ to 13.
Bulking up even that substantially is possible and one-quarter head size could be related but 2.5 shoe sizes?!?!?!