Nike Air Max 95 - Running Man

John Mayer was spotted wearing these shoes sometime in 2008 at an NYC camera shop. These are part of Nike's "Running Man Pack," designed by Parra, who previously worked with Nike when he designed some Air Max 1’s. He is known for his trademark use of the pink / blue / purple shades which are also used in much of his artwork.

Nike Air Structure Triax 91

Nike Air Max Structure Triax 91. John Mayer spotted in these in LA, 2008. Can be purchased at Fight Club New York online for about $200.

Nike Air Max 95 - 360

The Air Max 95 - 360 One Time Only sail/medium brown-sheen features the air bubble from the Air Max 360 and adds some flavor the the upper’s colorway. This edition features red, pink, and brown in its design. John Mayer was spotted wearing these in 2008 in NYC.

(Pino, a member of the John Mayer Trio is wearing Asics).

Nike Air Max 89 - Stab

Oldie but goodie when John Mayer and TMZ had fun in NYC circa 2008 summer (excluding first picture). In both pictures, he is wearing Nike Air Max (1989) - Stab. Of the many color variations made in Stab, these are brown/white version. He's also back in the 80's with those Oakley frogskins.

Visvim Gabo Elk

These are constructed of Visvim’s famous elk leather and shoe construction similar to Kiefer in profile with select details on the rear including a collar and fringe. Recently spotted on Mayer in NYC, 9/2009.

Acronym - SS-J4 Softshell Jacket

I know these aren't sneakers, but because the jacket is everything a jacket should be, I'm dedicating a post to it.
John Mayer is wearing an Acronym SS-J4 Softshell Jacket. If you have $530 laying around, you can purchase this from a few select retailers. As it advertised, "Acquiring an Acronym softshell is not just buying a jacket. Like a friend that steps in when things get hectic, you´ll find yourself relying on it, trusting it, respecting it´s toughness, valuing it´s loyalty."
Read more about its specs and a liquid test performed on the jacket here.
Nice jacket, John. (The other guy wearing the jacket is a 'model' for Acronym)

Nike Air Max 90 - Infrared

Not the only time John Mayer has worn a Nike Air Max Infrared make. Recently spotted 9/09 in NYC. These are popular, yet expensive running shoes that can be bought online (and aren't sold out) for around $200 - $300.