My understanding is sleeves are not allowed in some races.

You must not have raced in a while. Its been legal going on year 2 now. Anything elbows up is allowed

My opinion:

1 piece is more comfortable
sleeves look dumb
Kiwami or Desoto are great brands. Good quality, good customer service.

Pros of each:

One piece:
More comfortable; no waistband
No gap in the tramp stamp area while on the bike

Two piece:
Easier to make a quick "nature break"
You can get two different sizes if your proportions require it.

I still have sleeveless suits but my next one will have sleeves. I believe you stay cooler with your shoulders covered but some might argue against that. It is kind of like running shirtless on a hot day vs. with a shirt...I think a shirt keeps you out of the sun and cooler.

I’ve never used a trinsuit just swim shorts

ITU tris allow sleeves on Tri suits?

My De Soto Sleeved top does not ride up.

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All I Wanted Was A Pepsi, Just One Pepsi

Team Zoot, Team Zoot Mid-Atlantic

Hi,
Please refer this link.
Hope you get clear idea about Triathlon wetsuits. What are triathlon wetsuits & How to select Triathlon wetsuits
https://www.justwetsuits.com/...akes-them-different/
https://www.justwetsuits.com/2016/11/10/5-top-triathlon-wetsuit-brands-every-triathlete-check/

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Triwilson : )

Have to ask why you mention wetsuits when the OP and everyone else is talking about tri-suits?

I won't comment on the pros/cons of sleeves, but I will say that my new Castelli All Out sleeved suit is the bomb. I was looking specifically for longer sleeves and these ones are perfect. The whole thing fits like a second skin but is very flexible and absolutely disappears during all three disciplines.

I have tried Kiwami and DeSoto in the past and they are probably good in their own right, but I found them to be neither as breathable or flexible. YMMV.