nike free 5.0 (not sure this is a "race flat" but its super light weight and provides minimal support).

I run no more than 1 hour in them on soft surfaces and track.

do not wear socks (also removed insole). weigh 145

Ahh, running shoes, I don't think there is a more subjective piece of equipment out there.

Either way, I'm about 155 and I wear Brooks Adrenaline 10s. which are advertised I believe as stability shoes. I've work them without socks before on distances sub-5k but they will cut up my ankles a bit, so I don't recommend it.

My 2 cents on the whole barefoot/flats/stability argument is that my shoes are comfortable for my feet and I have been injury in the 4 years since I've begun wearing them although I do also have a stretching and rolling regime after each work out. I'd say once you find a pair of shoes (or no shoes) that you like, stick with 'em.

I use a discontinued version of the Adizero flats- similar to the Adizero Pro. Ultra light weight. First pair of Adididas running shoes I have ever liked.

I use them for Sprints and Olys, sans socks and would never consider them for anything longer than 10k, although I use them at Alcatraz, but that was off road so much, the extra mileage was hardly felt. I weigh between 175- 185 depending on season :)

Nike Free Run (2.9) I wear them for racing, and training anything longer than 1.5 hours or on rough trails. Otherwise I wear Vibram FiveFingers. I weigh 160. I can wear them sockless for 5 - 10 miles.

I've been racing in the Nike LunarRacers. Scary light shoe that still provides some cushioning without being spongy, not much support.
I weigh 174 and have used these shoes from 10K to IM. sockless shorter, socks for longer

Racing in Zoot Ultra TT 2.0's - triathlon specific shoes with no-tie laces and I do not wear socks. Really like them. Have not yet worn them for more than 10k or so.

Train in Nike Elite +4 - typical heavy stability shoe.

I weight about 150lb.

Nike Free 7.0, for me, they have just the right amount of cushion, and are insanely lightweight. I train and race in them - everything from a 5k to LSD runs. I do wear socks, and I weigh about 160.

I really like oasics. The one I am using right now is GEL-160TR (Ladies). I find they are the best for shock absorption and providing good support. I also wear orthotics, so unfortunately I had to take the soles out to get them to fit. I weigh about 135lbs. I prefer to not wear socks, but I find I have to get used to the shoe first before I can race like that, there is always a breaking in period. I run 3x week distances less than 10K.

Pearl Izumi Streaks, no socks for tri's, raced a road 10mi in them, weigh 110-115lbs... They're too wide for me so I'm looking for something Saucony or Mizuno for my next pair. I wear light stability shoes for training (Saucony Guide / Mizuno Nirvana or Elixer) and those light light light neutral flats for racing.

Newton Neutral racers, no socks, no insoles. If you wear out the lugs evenly and don't heel strike these shoes can last longer than 400 miles. I weigh 170 -175ibs. I run up to 13 miles in these shoes. I have no desire to run anything longer. Most who don't like the shoes is bc of how sore you get when first running in them.

Not really a racing flat, but Zoot Ultra Tempo+

I bought this shoe for triathlons, and then just started using it for road races. Also used about once every 2 weeks, or if all my other shoes were wet. Any distance. When it came time for my marathon, I didn't really think about it, I just used it. Ran my goal of 3:09 and never second guessed my decision. Before my next marathon the owner of our local running store found out I planned on using this and gave a very disapproving look. That was 2 weeks before my race, and I didn't want to know what he was thinking. Change nothing! A few months after the race I asked him why.

He said that for someone that requires support like I do, wearing a shoe like that will cause the muscles to break down faster. No big deal in a shorter distance, but not good for a marathon. I didn't ask at what distance I should ditch the Zoots and wear trainers. I have a feeling most the people reading this already knew that. I didn't.

[quote=TryScott]Not really a racing flat, but Zoot Ultra Tempo+

He said that for someone that requires support like I do, wearing a shoe like that will cause the muscles to break down faster. No big deal in a shorter distance, but not good for a marathon. I didn't ask at what distance I should ditch the Zoots and wear trainers. I have a feeling most the people reading this already knew that. I didn't.[/quote]

I wouldn't sweat it. Those Zoots were pretty much designed as an IM racing shoe. A Lot of people will run marathons in less than that, like the Brooks T6 or ST4. It's not like you're running in them all the time.