For shorter races (maybe just above Oly and less), a skinsuit would be okay, or if you have no philosophical problems peeing in your shorts. The only real disadvantage I can come up with is the whole inconvenience of a bathroom break. Small but very real aero advantage to a one-piece. It's a trade-off that only you can resolve for yourself.

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The full tri skin suits definately have their advantages and their fans.

I have always been a fan of seperates for the following reasons:

- They can make relieveing yourself easier - just drop the drawers

- Better ventilation

- Can change into fresh/different top for the run( believe me in a long race this can be huge)

- You can more easily customize top(s) worn for weather conditions hot/cold etc. . .

- You can customize tops for function - on the bike tight fitting and aero with pockets with good sun protection then on then loose fitting and comfortable top for the run.

- and so on . .

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Steve Fleck @stevefleck | Blog

My .02 is for everything half Ironman and below go with a one piece suit that fits you nice and maybe has one small pocket. Wear a number belt and put it on before you put your wetsuit on and you won't have to bother to put it on during the race. For Ironman distance- I go with a seperate top and bottom. Usually I wear a triathlon brief under a pair of tri shorts and a sleeveless triathlon jersey with a couple pockets on the bike then pull the tri shorts off and pull on a shorty singlet for the run and wear a super small fanny pack or fuel-belt type thing for the run. I don't like wearing a lot below the waste during an Ironman run since you're usually dumping cups over your head so your clothing is trapping a bunch of water and can get all saggy and soaked and also I'll inevitably have to pee during the run and I don't stop to do it, I just let it rip while I'm running. Although I was OK with it when I was 2 (I'm told) I don't like running around soaked in my own pee too much anymore so a triathlon brief (Speedo type thing) dries faster and helps me keep that "fresh" feeling.

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Tom Demerly
The Tri Shop.com

personally, i like the skinsuit. To me it is more comfortable, and i jest have that 'fast feel'. As said up top though, you might need a 2 piece to take a leak.... it is possible with the 2 piece, but you would have to stop definately.

i had been wearing two piece suits, but i got tired of having a little strip of sunburn above my shorts and below my top. So i got the skinsuit by RNH, also i figured, if i got really hot, i could pull down the top and run (although i never did this). The problem with the bathroom, its not huge but its there. You either pee your pants, which i did on the bike once at a 1/2 IM, or i pulled out mr jimmy through the leg of the suit on the run a couple of times. I guess theres an aero advantage---but its not one youre going to feel. This year, i went back to a 2 piece set up, i wanted the Power material Desoto uses, but i didnt want their 2 piece (dont like the color blocking).

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I'll vote for the 2 piece. I've tried on the single peice suits and don't like the feel. Probably for the same reason that I want to try out a 2 piece wetsuit to improve the fit. I like the two piece since you can go with a tight top for sprint races or a more loosely fitting top (I use the RnH Long Course top) when doing longer races.