[MisterI]

They are wearing golf hats, not baseball hats. The black hat is a Bridgestone golf hat. I haven’t figured out the white hat yet.

[muawiyah]

Rings in the ears ~

[Sacajaweau]

Obviously they wanted to be able to keep an eye on each other...hence the unusual hats.

[Hayride]

Go to google images and type in “black backpacks Boston marathon”.

[Graewoulf]

” - - - The black hat is a Bridgestone golf hat. - - -”

Note to FBI: Find that back hat and sample hairs on hat for DNA.