They make you more sleak and smooth you out in the water, hydrodynamics.

most triathletes are pretty slim so how does that happen?

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2018 Races: IM Santa Rosa, Vineman Monte Rio, Lake Tahoe 70.3

I'm sure a lot of people on here will tell you otherwise but I agree. Only proof I have is at Kona in a few years ago myself and a friend who pretty much always swim the same time including the 3.8km on course swim race the week before both wearing just swim briefs, in IM and 70.3 with wetsuits. Our coach in his day who would often lead pros out the water here in Australia and set course records said don't bother wearing one it is no advantage. Listening to all the propaganda that the companies spin I bought one and swum in it for the race and my mate didn't. Low and behold we were both within 20 seconds of each other in the race. That said I keep wearing it now I have it at non wetsuit races. FOMO

^ do you mean to say you were 20s ahead

If you have a tight fitting sleeveless tri kit I can't see a need based on some heavy personal testing.

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Yes I was in front but it was about the same 20 sec as every other swim I usually beat them by. No conceivable difference to any other swim.

My only comparison was I was slightly slower in a recent sprint with a sleeveless huub wetsuit then my sleeveless tri kit. But I chalk that up to it being more crowded and getting hit and bumped more and having to swim around ppl. Maybe I should swim over ppl .... which honestly I feel like some do to me.

My next tri, I was going to give the swimskin a go... but the distance is longer then my normal sprint.

My (more limited) experience as well

Most triathlon suits are loose fitting by swimming standards. That loose clothing creates a lot of drag. A swimskin is tighter and holds it all in. Most of the time I would prefer an ITU trisuit for sprint or oly

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http://en.wikipedia.org/...eoesophageal_fistula
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2020 National Masters Champion - M40-44 - 400m IM
Canadian Record Holder 35-39M & 40-44M - 200 m Butterfly (LCM)

If they are loose fitting swimming they will be loosing fitting biking. That isn't good. I had a suit that I could feel flapping around the neck a bit while swimming. It "felt" slow because of that flapping, but the clock did not lie. It still beat the swimskins. I think the real key is to get a tight fighting suit. That also probably means you will get less races out of it as it stretches out. One of the benefits of the swimskins is that it seemed to retain the shape and tightness without sagging thru the weeks of testing. That was only for one of the suits, the other suits was made of a different material and that swimskin seemed like it also stretched and slowed down as testing continued. It was also wet everyday the next day, while the skin that stayed tight was dry.

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A proper fitted TT skinsuit is loose compared with an size 26 arena carbon pro. I said loose by swimming standards.

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___________________________________________
http://en.wikipedia.org/...eoesophageal_fistula
http://en.wikipedia.org/wiki/Cerebral_palsy
2020 National Masters Champion - M40-44 - 400m IM
Canadian Record Holder 35-39M & 40-44M - 200 m Butterfly (LCM)

you aint kidding.. I got one of those fast speedo jammers X-whatever in my correct size according to the website and thought to myself this is going to take awhile to get on... damn thing is tight.

And just think how Santo puts his size 24 on...

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___________________________________________
http://en.wikipedia.org/...eoesophageal_fistula
http://en.wikipedia.org/wiki/Cerebral_palsy
2020 National Masters Champion - M40-44 - 400m IM
Canadian Record Holder 35-39M & 40-44M - 200 m Butterfly (LCM)