Flats for Running Fast
Nike Mayflys:

Good sustainable design.  Wicked light.  My pronation is pretty neutral and they never give me any problems- although support may be an issue if worn in a half marathon.  100k limit is actually quite a bit of running if you don't run a road race in them every weekend....and the price is good, and it is minimalist.
The Nike Air Zoom Katana Racer IIs:

I qualified for the 2007 US Men's Olympic Marathon Trials in these flats.  Great weight to support ratio.  They make your
feet feel quick and fast.  Good traction on pavement, a little
spring and flexsion.
The Nike Air Zoom Katana Rac3r IIIs:

Looks bad....is bad....in a badass/good way that is.  The new and improved looking Katana is out and I have a sleak looking pair.  These things are badass. Lightweight and very good support- they have a little more give then the Katana IIs.
The Nike Zoom Marathoner:
A must-have classic. I always have a fresh new pair of these stored in mint condition.  They weigh a little more than the Katana IIs, but they have added support and spring...they put you more up on your forefoot/toes.  Ritz runs in these.
The Nike Zoom Streak XCs:

Like the marathoner, but lighter and more flexible. This is a great shoe for running shorter tempo runs or 5k-10k races in.  Allows for more natural foot flexsion and pronation.  The bottom traction is a lot different from the Katanas because the sole has grooves more like the marathoner.
Note: images came from RoadRunnersports.com and eastbay.com -they may appear a little distorted and are not in respective scale to each other.
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