These hats were custom made snapbacks by Mitchell and Ness.  Featured in the photos are the "Arch" and "Script" styles along with the official team logo on some of the snapbacks.  Most of the teams are done in their original team colors with the exception of the California Republic which is done in a gray, teal and metallic gold colorway and is made by New Era Cap.  

The Mitchell and Ness snapbacks all come with a high crown and a square visor whereas the New Era snapbacks come with the round visor.  Snapbacks made a big comeback in late 2009/early 2010 and have been a favorite amongst the masses.