Mostly just an impression i've got from a unch of things. Textured fabric to trip the boundary layer turbulent and increase adhesion (reduction of pressure drag) will increase the surface friction (skin drag), but at cycling speeds and for the shapes covered (arms are not airfoils) pressure drag is the supermajority of the load. I have read that the ribbing can be effective only at high speeds and actually slower at lower speeds Titanflexr wrote:For aero, look for ribbed/textured fabric on the arm/shoulders. Super easy to get off and pull down quickly, if needed :-) Definitely worth a look The best feature is how well the full zip top is designed. I have raced a 1/2 Marathon at 0 degrees centigrade (32 F) and then a 70.3 starting at 1 pm at constant temps at 32-33 c (92 + F) with 75-80% humidity, and the suit was very comfortable for both races, so body heat regulation is very good. It has a huge amount of storage, which I was concerned about and don’t need, but the swim test indicated they stay flat against the body and don’t create any drag. This is a good indication that the suit is staying snug, and not creating additional drag in the water, and should perform at least as well in the wind. I did a swim test, Trisuit vs speedo only, and to my surprise I was as fast in the Trisuit as without (I am a 1:20 ish per 100 yard swimmer). I am small in the waist and hips, but large shoulders, arms, chest and legs- and this is the only suit or even separate piece with absolutely no wrinkles. As stated, fit is huge, and the Kiwami has an amazing about of stretch, allowing it to fit snug and comfortable on a large range of body shapes. Other than that, I would say the new Kiwami Spider 2 Aero is by far the best. I have tried most of the major Trisuits, the notable exception being ROKA.
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