Repost of something I put up a few weeks ago. Search this forum for thread entitled "You don't have to be COLD to be DRY!" to see further discussion/info on the topic. I'm very pleased with the DUI 30/30 - possibly the best "bang for the buck" money I've ever spent on scuba gear - and am happy to answer any specific questions here or via PM.
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Just got back from a week of diving dry in Bonaire (33 dives in 6 days), where my buddy and I were teased relentlessly by nearly every other diver on the island. Even the folks that cut their own Town Pier night dives short because they were cold made fun of my DUI 30/30 "tropical" dry suit!
As comfortable in 80F
UNDER water...
...as it is in 85F
ABOVE water!
My trusty DUI 30/30 has now been to Florida (3x), Hawaii (2x), St Kitts, Grand Cayman, Little Cayman, Cayman Brac, Curacao and now Bonaire. After more than 75 or so dives in ~80F water with the suit I can assure you that dry is the only way to dive! (In fact, since buying the 30/30 the only time I've worn a wetsuit has been in The Scuba Connection's heated pool!)
I've been surprised from the very beginning how comfortable the 30/30 is ABOVE water. Have worn it in full-sun 90F+ with no problem. In fact I've been much hotter and more uncomfortable in a 3mm wetsuit while gearing up and waiting to enter than I've ever been in the DUI.
DUI touts the material as a "breathable" trilam (
DUI's "Tropical Dry" technology) and it really seems to work as advertised. As you can see in the picture above, laying in the noon sun at +85F with the top of the suit simply zipped down is plenty comfortable. In fact, I never once sweated in the thing the whole week in Bonaire. That includes jaunts up and down 1,000 Steps, Karapata, and rock-climbing in and out of sites like Bise Morto and some other unmarked sites up in the park and elsewhere.
The thin Capilene 3 top and bottom I wear underneath (as well as DUI's Stretchliner) is great on the surface because it allows wind to flow through and sweat to evaporate, but blocks the sun effectively.
If you like diving dry in the Northeast, I can wholeheartedly recommend doing it everywhere else!